OPTICAL WAVEGUIDES AND METHODS OF CREATING OPTICAL WAVEGUIDES
An optical waveguide is configured such that when electromagnetic radiation enters a first end face of an optical core, an initial portion of the electromagnetic radiation exits the optical core via a peripheral surface, and a final portion of the electromagnetic radiation, remaining in the optical core after the initial portion of the electromagnetic radiation exits the optical core, exits the optical core via a second end face.
This application is a divisional of and claims priority to U.S. patent application Ser. No. 15/706,546, entitled SYSTEMS AND METHODS FOR ADDITIVELY MANUFACTURING AN OBJECT and filed on Sep. 15, 2017, the disclosure of which is incorporated herein by reference.
FIELDThe present disclosure relates to additive manufacturing.
BACKGROUNDA 3D printing process may use a feedstock material, extruded from a print head, to additively manufacture a part by layering the feedstock material. The feedstock material may comprise a polymer and reinforcing fibers, such as carbon fibers, which are opaque to visible and ultra-violet light. When the polymer in the feedstock material is a photopolymer, a source of curing energy may be directed at the feedstock material, dispensed by the print head, to solidify the feedstock material. However, when the reinforcing fibers are opaque to the curing energy, they cast shadows and prevent the curing energy, originating directly from the source of curing energy, from irradiating and curing the photopolymer in the shadows.
SUMMARYAccordingly, apparatuses and methods, intended to address at least the above-identified concerns, would find utility.
The following is a non-exhaustive list of examples, which may or may not be claimed, of the subject matter according to the invention.
One example of the subject matter, disclosed herein, relates to an optical waveguide that is configured such that when electromagnetic radiation enters a first end face of an optical core, an initial portion of the electromagnetic radiation exits the optical core via a peripheral surface and a final portion of the electromagnetic radiation, remaining in the optical core after the initial portion of the electromagnetic radiation exits the optical core, exits the optical core via a second end face.
Accordingly, when the electromagnetic radiation enters the first end face, it will exit both the peripheral surface and the second end face, as opposed, for example, to the electromagnetic radiation being fully emitted via the peripheral surface. Such examples of the optical waveguide are well suited for inclusion in feedstock lines with additive manufacturing systems and methods in which the electromagnetic radiation is directed at the first end face as the feedstock line is being constructed and as an object is being manufactured. That is, an additive manufacturing system may be configured to construct a feedstock line while the object is being manufactured from the feedstock line, and while the electromagnetic radiation is entering the first end face. Because the electromagnetic radiation exits not only the peripheral surface, but also the second end face, it is ensured that sufficient electromagnetic radiation travels the full length of the optical waveguide to operatively cure the resin of the feedstock line that is in the shadows of the reinforcing fibers.
Another example of the subject matter, disclosed herein, relates to a method of modifying an optical fiber to create an optical waveguide. The optical fiber comprises an optical core, having an optical-core refractive index, and a cladding, comprising at least a first resin, having a first-resin refractive index that is lower than the optical-core refractive index. The cladding covers the peripheral surface of the optical core and extends between a first end face and a second end face of the optical core. The method comprises a step of removing portions of the cladding to expose regions of the peripheral surface, such that at least a portion of electromagnetic radiation, entering the optical core via at least one of the first end face, the second end face, or the peripheral surface, exits the optical core via the regions of the peripheral surface.
The method provides an inexpensive process for creating an optical waveguide for use in additive manufacturing systems and methods. For example, an off-the-shelf cladded optical fiber may be used as the optical fiber, and portions of the cladding simply may be removed at regions that are appropriately spaced apart to result in the desired functions of the optical waveguide.
Yet another example of the subject matter, disclosed herein, relates to a method of modifying an optical core to create an optical waveguide. The optical core comprises a first end face, a second end face, opposite the first end face, and a peripheral surface, extending between the first end face and the second end face. The method comprises a step of applying a first resin to the peripheral surface of the optical core so that regions of the peripheral surface remain uncovered by the first resin. The first resin has a first-resin refractive index. The optical core has an optical-core refractive index that is greater than the first-resin refractive index. At least a portion of electromagnetic radiation, entering the optical core via at least one of the first end face, the second end face, or the peripheral surface, exits the optical core via the peripheral surface.
The method provides an inexpensive process for creating an optical waveguide for use in additive manufacturing systems and methods. For example, an off-the-shelf non-cladded optical fiber may be used as the optical core, and the first resin may be applied to the peripheral surface thereof.
Another example of the subject matter, disclosed herein, relates to a method of modifying an optical core to create an optical waveguide. The optical core comprises a first end face, a second end face, opposite the first end face, and a peripheral surface, extending between the first end face and the second end face. The method comprises a step of increasing surface roughness of all or portions of the peripheral surface of the optical core so that at least a portion of electromagnetic radiation, entering the optical core via at least one of the first end face, the second end face, or the peripheral surface, exits the optical core via the peripheral surface.
The method provides an inexpensive process for creating an optical waveguide for use in additive manufacturing systems and methods. For example, an off-the-shelf non-cladded optical fiber may be used as the optical core, and the peripheral surface thereof may be roughened.
Having thus described one or more examples of the invention in general terms, reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and wherein like reference characters designate the same or similar parts throughout the several views, and wherein:
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In the following description, numerous specific details are set forth to provide a thorough understanding of the disclosed concepts, which may be practiced without some or all of these particulars. In other instances, details of known devices and/or processes have been omitted to avoid unnecessarily obscuring the disclosure. While some concepts will be described in conjunction with specific examples, it will be understood that these examples are not intended to be limiting.
Unless otherwise indicated, the terms “first,” “second,” etc. are used herein merely as labels, and are not intended to impose ordinal, positional, or hierarchical requirements on the items to which these terms refer. Moreover, reference to, e.g., a “second” item does not require or preclude the existence of, e.g., a “first” or lower-numbered item, and/or, e.g., a “third” or higher-numbered item.
Reference herein to “one example” means that one or more feature, structure, or characteristic described in connection with the example is included in at least one implementation. The phrase “one example” in various places in the specification may or may not be referring to the same example.
As used herein, a system, apparatus, structure, article, element, component, or hardware “configured to” perform a specified function is indeed capable of performing the specified function without any alteration, rather than merely having potential to perform the specified function after further modification. In other words, the system, apparatus, structure, article, element, component, or hardware “configured to” perform a specified function is specifically selected, created, implemented, utilized, programmed, and/or designed for the purpose of performing the specified function. As used herein, “configured to” denotes existing characteristics of a system, apparatus, structure, article, element, component, or hardware which enable the system, apparatus, structure, article, element, component, or hardware to perform the specified function without further modification. For purposes of this disclosure, a system, apparatus, structure, article, element, component, or hardware described as being “configured to” perform a particular function may additionally or alternatively be described as being “adapted to” and/or as being “operative to” perform that function.
Illustrative, non-exhaustive examples, which may or may not be claimed, of the subject matter according the present disclosure are provided below.
Referring generally to
System 700 therefore may be used to manufacture object 136 from a fiber reinforced composite material that facilitates in situ curing of resin 124. More specifically, inclusion of at least one optical modifier 123 in feedstock line 100 facilitates penetration of electromagnetic radiation 118 into interior volume 182 of feedstock line 100 for irradiation of resin 124, despite regions of resin 124 being in the shadows of elongate filaments 104 cast by the direct (i.e., line-of-sight) application of electromagnetic radiation 118. In other words, even when electromagnetic radiation 118 is shielded from directly reaching all regions of resin 124, at least one optical modifier 123 will redirect electromagnetic radiation 118 to indirectly reach regions of resin 124. As a result, feedstock line 100 may be more easily cured in situ by curing mechanism 706, may be more evenly cured in situ by curing mechanism 706, may be more thoroughly cured in situ by curing mechanism 706, and/or may be more quickly cured in situ by curing mechanism 706.
Elongate filaments 104 additionally or alternatively may be described as reinforcement filaments or fibers, and may be constructed of any suitable material, illustrative and non-exclusive examples of which include (but are not limited to) fibers, carbon fibers, glass fibers, synthetic organic fibers, aramid fibers, natural fibers, wood fibers, boron fibers, silicon-carbide fibers, optical fibers, fiber bundles, fiber tows, fiber weaves, wires, metal wires, conductive wires, and wire bundles. Feedstock line 100 may include a single configuration, or type, of elongate filaments 104 or may include more than one configuration, or type, of elongate filaments 104. In some examples, elongate filaments 104 may individually and collectively extend for the entire, or substantially the entire, feedstock-line length, and thus may be described as continuous elongate filaments or as full-length elongate filaments. Additionally or alternatively elongate filaments 104 may individually extend for only a portion of the feedstock-line length, and thus may be described as partial-length elongate filaments or non-continuous elongate filaments. Examples of partial-length elongate filaments include (but are not limited to) so-called chopped fibers.
Resin 124 may include any suitable material that is configured to be cured, or hardened, as a result of cross-linking of polymer chains, such as responsive to an application of electromagnetic radiation 118. For example, electromagnetic radiation 118, or curing energy, may comprise one or more of ultraviolet light, visible light, infrared light, x-rays, electron beams, and microwaves, with curing mechanism 706 being a source of such electromagnetic radiation 118, and resin 124 may take the form of one or more of a polymer, a resin, a thermoplastic, a thermoset, a photopolymer, an ultra-violet photopolymer, a visible-light photopolymer, an infrared-light photopolymer, and an x-ray photopolymer. As used herein, a photopolymer is a polymer that is configured to be cured in the presence of light, such as one or more of ultra-violet light, visible-light, infrared-light, and x-rays. However, as discussed, inclusion of at least one optical modifier 123 in feedstock line 100 specifically facilitates the penetration of electromagnetic radiation 118 into the shadows of elongate filaments 104, and thus electromagnetic radiation 118 typically will be of a wavelength that does not penetrate elongate filaments 104, and resin 124 typically will be a photopolymer.
Some examples of system 700 additionally or alternatively may be described as 3-D printers. System 700 also may be described as a fused filament fabrication system, with delivery guide 704 additionally or alternatively being described as a print head or nozzle.
Referring generally to
Elongate filaments 104 typically will be selected for strength properties and not for light-transmissivity properties. For example, carbon fibers are often used in fiber-reinforced composite structures, and carbon fibers are opaque to ultra-violet and visible light. Accordingly, elongate filaments 104 that are opaque to electromagnetic radiation 118 are well suited for inclusion in feedstock line 100, as at least one optical modifier 123 operatively will redirect electromagnetic radiation 118 into the shadows of elongate filaments 104.
Referring generally to
Inclusion of at least one full-length optical waveguide 102 in feedstock line 100 facilitates penetration of electromagnetic radiation 118 into interior volume 182 of feedstock line 100 for irradiation of resin 124, despite regions of resin 124 being in the shadows of elongate filaments 104. More specifically, even when electromagnetic radiation 118 is shielded from directly reaching all regions of resin 124, at least one full-length optical waveguide 102 will receive electromagnetic radiation 118 via one or more of its first full-length-optical-core end face 112, its second full-length-optical-core end face 114, or its full-length peripheral surface 116, and disperse electromagnetic radiation 118 via at least its full-length peripheral surface 116 to indirectly reach regions of resin 124.
Referring generally to
In other words, in some examples of feedstock line 100, at least one full-length optical waveguide 102 is positioned within interior volume 182 of feedstock line 100 such that at least one of full-length peripheral surface 116, first full-length-optical-core end face 112, or second full-length-optical-core end face 114 is within the line of sight of electromagnetic radiation 118 to receive electromagnetic radiation 118 directed to exterior surface 180 of feedstock line 100 by curing mechanism 706 and then disperse electromagnetic radiation 118 into the shadows of elongate filaments 104. For example, at least one of full-length peripheral surface 116, first full-length-optical-core end face 112, or second full-length-optical-core end face 114 may be adjacent to exterior surface 180 of feedstock line 100.
Referring generally to
In other words, in some examples of feedstock line 100, if electromagnetic radiation 118 enters first full-length-optical-core end face 112, it will exit both full-length peripheral surface 116 and second full-length-optical-core end face 114, as opposed, for example, to electromagnetic radiation 118 being fully emitted via full-length peripheral surface 116. Accordingly, such full-length optical waveguide 102 is configured to ensure that electromagnetic radiation 118 travels through a substantial portion of full-length optical core 110, effectively leaking electromagnetic radiation 118 along the way and thereby penetrating multiple regions of resin 124 of feedstock line 100.
Referring generally to
In such configurations, it is ensured that a desired amount of electromagnetic radiation 118 exits full-length optical core 110 via full-length peripheral surface 116 to operatively cure resin 124 among elongate filaments 104 within interior volume 182 of feedstock line 100, when feedstock line 100 is utilized by an additive manufacturing system or in an additive manufacturing method.
Referring generally to
By at least one full-length optical waveguide 102 being generally parallel to elongate filaments 104, the reinforcing properties of elongate filaments 104 within feedstock line 100, and thus within object 136 are not materially affected. By being twisted with, woven with, or braided with elongate filaments 104, at least one full-length optical waveguide 102 is interspersed with elongate filaments 104 so that electromagnetic radiation 118, exiting at least one full-length optical waveguide 102, is delivered to regions of interior volume 182 that are in the shadows of elongated filaments 104.
Referring generally to
By full-length-optical-core cladding 154 being non-uniform along the length of the full-length optical waveguide, electromagnetic radiation 118 is permitted to exit full-length optical core 110 via full-length peripheral surface 116. Moreover, by first full-length-optical-core cladding resin 156 having a refractive index that is lower than that of full-length optical core 110, electromagnetic radiation 118, upon entering full-length optical core 110, is trapped within full-length optical core 110 other than the regions where first full-length-optical-core cladding resin 156 is not present. As a result, at least one full-length optical waveguide 102 may be constructed to provide a desired amount of electromagnetic radiation 118, exiting various positions along full-length peripheral surface 116, such as to ensure a desired amount of electromagnetic radiation 118, penetrating the shadows of elongate filaments 104.
Referring generally to
By covering full-length-peripheral-surface regions 127 with second full-length-optical-core cladding resin 158, a desired refractive index thereof may be selected to optimize how electromagnetic radiation 118 exits full-length peripheral surface 116. Additionally or alternatively, with full-length-peripheral-surface regions 127 covered with second full-length-optical-core cladding resin 158, the integrity of first full-length-optical-core cladding resin 156 may be ensured, such that it does not peel or break off during storage and handling of feedstock line 100.
Referring generally to
Such full-length optical waveguides may be more easily manufactured, in that full-length optical core 110 with first full-length-optical-core cladding resin 156 simply may be fully coated with second full-length-optical-core cladding resin 158. Additionally or alternatively, the integrity of full-length optical waveguides may be maintained during storage thereof, as well as during construction and storage of feedstock line 100.
Referring generally to
Because second full-length-optical-core cladding resin 158 has a refractive index lower than that of resin 124, electromagnetic radiation 118 will be permitted to exit second full-length-optical-core cladding resin 158 to penetrate and cure resin 124 when feedstock line 100 is used to additively manufacture object 136 by system 700.
Referring generally to
Rather than relying on refractive-index properties of a cladding to ensure desired dispersal of electromagnetic radiation 118 from full-length optical core 110 via full-length peripheral surface 116, the surface roughness of full-length peripheral surface 116 is selected such that electromagnetic radiation 118 exits full-length optical core 110 at desired amounts along the length of full-length peripheral surface 116. For example, the surface roughness may create regions of internal reflection of electromagnetic radiation 118 within full-length optical core 110 and may create regions where electromagnetic radiation 118 is permitted to escape full-length optical core 110.
Referring generally to
Full-length optical waveguides without any cladding may be less expensive to manufacture than full-length optical waveguides with cladding. Additionally, the difference of refractive indexes between a cladding and resin 124 need not be taken into account when selecting resin 124 for feedstock line 100.
Referring generally to
By including a plurality of full-length optical waveguides, interspersed among elongate filaments 104, such as among a bundle, or tow, of elongate filaments, a desired penetration of electromagnetic radiation 118 into the shadows of elongate filaments 104 is be ensured.
Referring generally to
By being twisted with, woven with, or braided with elongate filaments 104, the plurality of full-length optical waveguides is interspersed with elongate filaments 104 so that electromagnetic radiation 118, exiting the full-length optical waveguides, is delivered to regions of interior volume 182 that are in the shadows of elongated filaments 104.
Referring generally to
Creating feedstock line 100 by system 700, as opposed to, for example, merely feeding feedstock line 100 from a pre-made supply of feedstock line 100, creates a versatile additive manufacturing system, in which the user may customize feedstock line 100 with desired properties. Moreover, creating feedstock line 100 from precursor tow 208 permits the use of off-the-shelf reinforcement fiber tows. Filament separator 210 separates precursor tow 208 into individual ones of elongate filaments 104 or into subsets 214 of elongate filaments 104, so that at least one full-length optical waveguide 102 may be operatively interspersed with elongate filaments 104. Combiner 212 then combines elongate filaments 104 and at least one full-length optical waveguide 102 into derivative full-length-optical-waveguide tow 209 to ultimately become feedstock line 100 with resin 124. Resin supply 206 dispenses resin 124 at any suitable location as feedstock line 100 is being created, including one or more of (i) at precursor tow 208 before it is separated into individual ones of elongate filaments 104 or into subsets 214 of elongate filaments 104, (ii) at elongate filaments 104 that have been separated from precursor tow 208, (iii) at at least one full-length optical waveguide 102 before it is combined with elongate filaments 104, or (iv) at derivative full-length-optical-waveguide tow 209 after at least one full-length optical waveguide 102 has been combined with elongate filaments 104.
Precursor tow 208 may take any suitable form depending on the desired properties of feedstock line 100. As mentioned, precursor tow 208 may be (but is not required to be) an off-the-shelf precursor tow, with such examples including tows having 1000, 3000, 6000, 12000, 24000, or 48000 continuous individual fibers within the tow, but other examples also may be used.
Filament separator 210 may take any suitable configuration, such that it is configured to operatively separate precursor tow 208 into individual ones of elongate filaments 104 or subsets 214 thereof. For example, filament separator 210 may comprise at least one of a knife, an air knife, a comb, a mesh, a screen, a series of polished idlers, and other mechanisms known in the art.
Combiner 212 may take any suitable configuration, such that it is configured to operatively combine elongate filaments 104 with at least one full-length optical waveguide 102, such that at least one full-length optical waveguide 102 becomes interspersed among elongate filaments 104. For example, combiner 212 may at least one of twist, weave, braid, or otherwise bundle elongate filaments 104 together with at least one full-length optical waveguide 102. Combiner 212 also may include a fixator, such as a mesh or screen, through which elongate filaments 104 and full-length optical waveguide(s) extend, and which prevents the twisting, weaving, braiding, or bundling from propagating upstream of combiner 212.
Resin supply 206 may take any suitable configuration, such that it is configured to operatively dispense and apply resin 124 at an operative location. For example, resin supply 206 may be configured to spray or mist resin 124. Additionally or alternatively, resin supply 206 may include a reservoir or bath of resin 124, through which is pulled at least one of precursor tow 208, individual ones of elongate filaments 104, subsets 214 of elongate filaments 104, full-length optical waveguide(s), or derivative full-length-optical-waveguide tow 209.
In some examples, dry-tow full-length-optical-waveguide feedstock-line subsystem 200 may further comprise chamber 224 between filament separator 210 and combiner 212, and through which individual ones of elongate filaments 104 or subsets 214 of elongate filaments 104 pass as feedstock line 100 is being created. In some such examples, at least one full-length optical waveguide 102 also extends through chamber 224. Moreover, in some such examples, resin 124 is applied to at least elongate filaments 104, and in some examples, also to at least one full-length optical waveguide 102, in chamber 224.
Referring generally to
By imparting a first electrical charge to elongate filaments 104 and by imparting a second opposite charge to resin 124 as it is applied to elongate filaments 104, resin 124 will be electrostatically attracted to elongate filaments 104, thereby facilitating wetting of elongate filaments 104 with resin 124.
Referring generally to
As discussed, by being twisted with, woven with, or braided with elongate filaments 104, at least one full-length optical waveguide 102 is interspersed with elongate filaments 104 so that electromagnetic radiation 118, exiting at least one full-length optical waveguide 102, is delivered to regions of interior volume 182 that are in the shadows of elongate filaments 104 when feedstock line 100 is used by system 700 to additively manufacture object 136.
Referring generally to
As discussed, creating feedstock line 100 by system 700, as opposed to, for example, merely feeding feedstock line 100 from a pre-made supply of feedstock line 100, creates a versatile additive manufacturing system, in which the user may customize feedstock line 100 with desired properties. Creating feedstock line 100 from precursor prepreg tow 908 permits the use of off-the-shelf prepreg reinforcement fiber tows. Prepreg-tow separator 910 separates precursor prepreg tow 908 into individual ones of elongate filaments 104 that are at least partially covered with resin 124 or into subsets 214 of elongate filaments 104 that are at least partially covered with resin 124, so that at least one full-length optical waveguide 102 may be operatively interspersed with elongate filaments 104. Combiner 212 then combines elongate filaments 104 and at least one full-length optical waveguide 102, together with resin 124, into derivative full-length-optical-waveguide prepreg tow 909 to ultimately become feedstock line 100. At least one heater 220 heats resin 124 to facilitate one or both of separation of precursor prepreg tow 908 or wetting-out of elongate filaments 104 and at least one full-length optical waveguide 102 in derivative full-length-optical-waveguide prepreg tow 909.
As discussed, combiner 212 may take any suitable configuration, such that it is configured to operatively combine elongate filaments 104 with at least one full-length optical waveguide 102, such that at least one full-length optical waveguide 102 becomes interspersed among elongate filaments 104. When combiner 212 is a component of prepreg-tow-full-length-optical-waveguide feedstock-line subsystem 900, combiner 212 also combines elongate filaments 104 with at least one full-length optical waveguide 102, such that elongate filaments 104 and at least one full-length optical waveguide 102 are at least partially covered by resin 124 in derivative full-length-optical-waveguide prepreg tow 909.
Heater 220 may take any suitable configuration, such that it is configured to heat resin 124 at an operative location as feedstock line 100 is being created. In some examples, heater 220 may utilize a heated fluid stream, such as a heated gas stream to heat resin 124. Additionally or alternatively, in some examples, heater 220 may comprise a resistive, or other type of, heater to heat resin 124, such as it passes through prepreg-tow separator 910 or combiner 212, such as with prepreg-tow separator 910 comprising heater 220 or combiner 212 comprising heater 220, respectively.
In some examples, two or more of the first threshold temperature, the second threshold temperature, or the third threshold temperature may be the same temperature. In other examples, two or more of the first threshold temperature, the second threshold temperature, or the third threshold temperature may be different temperatures.
Referring generally to
By applying additional resin 125 to elongate filaments 104 and full-length optical waveguide(s), full wet-out of elongate filaments 104 and full-length optical waveguide(s) may be achieved in feedstock line 100.
Additional-resin supply 906 may take any suitable configuration, such that it is configured to operatively dispense and apply additional resin 125 at an operative location. For example, additional-resin supply 906 may be configured to spray or mist additional resin 125. Additionally or alternatively, additional-resin supply 906 may include a reservoir or bath of additional resin 125, through which is pulled at least one of precursor prepreg tow 908, individual ones of elongate filaments 104, subsets 214 of elongate filaments 104, full-length optical waveguide(s), or derivative full-length-optical-waveguide prepreg tow 909.
In some examples, additional resin 125 may be the same as resin 124. In other examples, additional resin 125 may be different from resin 124.
In some examples, prepreg-tow full-length-optical-waveguide feedstock-line subsystem 900 may further comprise chamber 224 between prepreg-tow separator 910 and combiner 212, and through which individual ones of elongate filaments 104 or subsets 214 of elongate filaments 104 pass as feedstock line 100 is being created. In some such examples, at least one full-length optical waveguide 102 also extends through chamber 224. Moreover, in some such examples, additional resin 125 is applied to at least elongate filaments 104, and in some examples, also to at least one full-length optical waveguide 102, in chamber 224.
Referring generally to
By imparting a first electrical charge to elongate filaments 104 or resin 124 and by imparting a second opposite charge to additional resin 125 as it is applied to elongate filaments 104 and resin 124, additional resin 125 will be electrostatically attracted to elongate filaments 104.
Referring generally to
As discussed, by being twisted with, woven with, or braided with elongate filaments 104, at least one full-length optical waveguide 102 is interspersed with elongate filaments 104 so that electromagnetic radiation 118, exiting at least one full-length optical waveguide 102, is delivered to regions of interior volume 182 that are in the shadows of elongate filaments 104 when feedstock line 100 is used by system 700 to additively manufacture object 136.
Referring generally to
Partial-length optical waveguides 122 may be cost effective to create, such as according to the various methods disclosed herein. Moreover, by being interspersed among elongate filaments 104, partial-length optical waveguides 122 may directly receive electromagnetic radiation 118 and deliver electromagnetic radiation 118 into the shadows of elongate filaments 104.
Partial-length optical waveguides 122 may be similar in construction to full-length optical waveguides disclosed herein but shorter in length.
Referring generally to
In other words, in some examples of feedstock line 100, partial-length optical waveguides 122 are positioned within interior volume 182 of feedstock line 100 such that at least one of partial-length peripheral surface 144, first partial-length-optical-core end face 140, or second partial-length-optical-core end face 142 is within the line of sight of electromagnetic radiation 118 to receive electromagnetic radiation 118 directed to exterior surface 180 of feedstock line 100 by curing mechanism 706 and then disperse, or scatter, electromagnetic radiation 118 within interior volume 182.
Referring generally to
By being non-uniform along the length of partial-length optical waveguides 122, electromagnetic radiation 118 is permitted to exit partial-length optical core 138 via partial-length peripheral surface 144. Moreover, by first partial-length-optical-core cladding resin 162 having a refractive index that is lower than that of partial-length optical core 138, electromagnetic radiation 118, upon entering partial-length optical core 138, is trapped within partial-length optical core 138 other than the regions where first partial-length-optical-core cladding resin 162 is not present. As a result, partial-length optical waveguides 122 may be constructed to provide a desired amount of electromagnetic radiation 118, exiting various positions along partial-length peripheral surface 144, such as to ensure a desired amount of electromagnetic radiation 118, penetrating the shadows of elongate filaments 104.
Referring generally to
By covering partial-length-peripheral-surface regions 129 with second partial-length-optical-core cladding resin 164, a desired refractive index thereof may be selected to optimize how electromagnetic radiation 118 exits partial-length peripheral surface 144. Additionally or alternatively, with partial-length-peripheral-surface regions 129 covered with second partial-length-optical-core cladding resin 164, the integrity of first partial-length-optical-core cladding resin 162 may be ensured, such that it does not peel or break off during storage of partial-length optical waveguides 122 or during construction and use of feedstock line 100.
Referring generally to
Such partial-length optical waveguides 122 may be more easily manufactured, in that partial-length optical core 138 with first partial-length-optical-core cladding resin 162 simply may be fully coated with second partial-length-optical-core cladding resin 164. Additionally or alternatively, the integrity of partial-length optical waveguides 122 may be maintained during storage thereof and during construction and use of feedstock line 100.
Referring generally to
Because second partial-length-optical-core cladding resin 164 has a refractive index lower than that of resin 124, electromagnetic radiation 118 will be permitted to exit second partial-length-optical-core cladding resin 164 to penetrate and cure resin 124 when feedstock line 100 is being used to additively manufacture object 136 by system 700.
Referring generally to
Rather than relying on refractive-index properties of a cladding to ensure desired dispersal of electromagnetic radiation 118 from partial-length optical core 138 via partial-length peripheral surface 144, the surface roughness of partial-length peripheral surface 144 is selected such that electromagnetic radiation 118 exits partial-length optical core 138 at desired amounts along the length of partial-length peripheral surface 144. For example, the surface roughness may create regions of internal reflection of electromagnetic radiation 118 within partial-length optical core 138 and may create regions where electromagnetic radiation 118 is permitted to escape partial-length optical core 138.
Referring generally to
Partial-length optical waveguides 122 without any cladding may be less expensive to manufacture than partial-length optical waveguides 122 with cladding. Additionally, the difference of refractive indexes between a cladding and resin 124 need not be taken into account when selecting resin 124 for feedstock line 100.
Referring generally to
As discussed, creating feedstock line 100 by system 700, as opposed to, for example, merely feeding feedstock line 100 from a pre-made supply of feedstock line 100, creates a versatile additive manufacturing system, in which the user may customize feedstock line 100 with desired properties. As also discussed, creating feedstock line 100 from precursor tow 208 permits the use of off-the-shelf reinforcement fiber tows. Filament separator 210 separates precursor tow 208 into individual ones of elongate filaments 104 or into subsets 214 of elongate filaments 104, so that partial-length optical waveguides 122 may be operatively interspersed with elongate filaments 104. Combiner 212 then combines elongate filaments 104 and partial-length optical waveguides 122 into derivative partial-length-optical-waveguide tow 1009 to ultimately become feedstock line 100 with resin 124. Resin supply 206 dispenses resin 124 at any suitable location as feedstock line 100 is being created, including one or more of (i) at precursor tow 208 before it is separated into individual ones of elongate filaments 104 or into subsets 214 of elongate filaments 104, (ii) at elongate filaments 104 that have been separated from the precursor tow 208, (iii) at or with partial-length optical waveguides 122 before they are combined with elongate filaments 104, or (iv) at derivative partial-length-optical-waveguide tow 1009 after partial-length optical waveguides 122 have been combined with elongate filaments 104.
Combiner 212 may take any suitable configuration, such that it is configured to operatively combine elongate filaments 104 with partial-length optical waveguides 122, such that partial-length optical waveguides 122 become interspersed among elongate filaments 104. For example, combiner 212 may at least one of twist, weave, braid, or otherwise bundle elongate filaments 104 together with partial-length optical waveguides 122. Combiner 212 also may include a fixator, such as a mesh or screen, through which elongate filaments 104 extend, and which prevents the twisting, weaving, braiding, or bundling from propagating upstream of combiner 212.
As discussed, resin supply 206 may take any suitable configuration, such that it is configured to operatively dispense and apply resin 124 at an operative location. For example, resin supply 206 may be configured to spray or mist resin 124. Additionally or alternatively, resin supply 206 may include a reservoir or bath of resin 124, through which is pulled at least one of precursor tow 208, individual ones of elongate filaments 104, subsets 214 of elongate filaments 104, or derivative partial-length-optical-waveguide tow 1009.
In some examples, dry-tow partial-length-optical-waveguide feedstock-line subsystem 1000 may further comprise chamber 224 between filament separator 210 and combiner 212, and through which individual ones of elongate filaments 104 or subsets 214 of elongate filaments 104 pass as feedstock line 100 is being created. Moreover, in some such examples, resin 124 is applied to at least elongate filaments 104, and in some examples, also to partial-length optical waveguides 122, in chamber 224.
Referring generally to
That is, combined partial-length-optical-waveguide resin supply 222 may dispense partial-length optical waveguides 122 in a volume of resin 124. Stated differently, partial-length optical waveguides 122 may be suspended within resin 124. By using combined partial-length-optical-waveguide resin supply 222, even dispersion of partial-length optical waveguides 122 may be ensured, and dry-tow partial-length-optical-waveguide feedstock-line subsystem 1000 may be constructed at a reduced cost. For example, combined partial-length-optical-waveguide resin supply 222 may spray or mist resin 124 and partial-length optical waveguides 122 together to apply them to elongate filaments 104, or elongate filaments 104 may be pulled through a bath of resin 124 with partial-length optical waveguides 122 suspended therein.
Referring generally to
As discussed, by imparting a first electrical charge to elongate filaments 104 and by imparting a second opposite charge to resin 124 as it is applied to elongate filaments 104, resin 124 will be electrostatically attracted to elongate filaments 104, thereby facilitating wetting of elongate filaments 104 with resin 124.
Referring generally to
As discussed, creating feedstock line 100 by system 700, as opposed to, for example, merely feeding feedstock line 100 from a pre-made supply of feedstock line 100, creates a versatile additive manufacturing system, in which the user may customize feedstock line 100 with desired properties. As also discussed, creating feedstock line 100 from precursor prepreg tow 908 permits the use of off-the-shelf prepreg reinforcement fiber tows. Prepreg-tow separator 910 separates precursor prepreg tow 908 into individual ones of elongate filaments 104 that are at least partially covered with resin 124 or into subsets 214 of elongate filaments 104 that are at least partially covered with resin 124, so that partial-length optical waveguides 122 may be operatively interspersed with elongate filaments 104. Combiner 212 then combines elongate filaments 104 and partial-length optical waveguides 122, together with resin 124, into derivative partial-length-optical-waveguide prepreg tow 1209 to ultimately become feedstock line 100. At least one heater 220 heats resin 124 to facilitate one or both of separation of precursor prepreg tow 908 or wetting-out of elongate filaments 104 and partial-length optical waveguides 122 in derivative partial-length-optical-waveguide prepreg tow 1209.
As discussed, combiner 212 may take any suitable configuration, such that it is configured to operatively combine elongate filaments 104 with partial-length optical waveguides 122, such that partial-length optical waveguides 122 become interspersed among elongate filaments 104. When combiner 212 is a component of prepreg-tow partial-length-optical-waveguide feedstock-line subsystem 1200, combiner 212 also combines elongate filaments 104 with partial-length optical waveguides 122, such that elongate filaments 104 and partial-length optical waveguides 122 are at least partially covered by resin 124 in derivative partial-length-optical-waveguide prepreg tow 1209.
Referring generally to
By applying additional resin 125 to elongate filaments 104 and partial-length optical waveguides 122, full wet-out of elongate filaments 104 and partial-length optical waveguide 122 may be achieved in feedstock line 100.
As discussed, additional-resin supply 906 may take any suitable configuration, such that it is configured to operatively dispense and apply additional resin 125 at an operative location. For example, additional-resin supply 906 may be configured to spray or mist additional resin 125. Additionally or alternatively, additional-resin supply 906 may include a reservoir or bath of additional resin 125, through which is pulled at least one of precursor prepreg tow 908, individual ones of elongate filaments 104, subsets 214 of elongate filaments 104, or derivative partial-length-optical-waveguide prepreg tow 1209.
In some examples, additional resin 125 may be the same as resin 124. In other examples, additional resin 125 may be different from resin 124.
In some examples, prepreg-tow partial-length-optical-waveguide feedstock-line subsystem 1200 may further comprise chamber 224 between prepreg-tow separator 910 and combiner 212, and through which individual ones of elongate filaments 104 or subsets 214 of elongate filaments 104 pass as feedstock line 100 is being created. Moreover, in some such examples, additional resin 125 is applied to at least elongate filaments 104, and in some examples, also to partial-length optical waveguides 122, in chamber 224.
Referring generally to
That is, combined partial-length-optical-waveguide additional-resin supply 1222 may dispense partial-length optical waveguides 122 in a volume of additional resin 125. Stated differently, partial-length optical waveguides 122 may be suspended within additional resin 125. By using combined partial-length-optical-waveguide additional-resin supply 1222, even dispersion of partial-length optical waveguides 122 may be ensured, and prepreg-tow partial-length-optical-waveguide feedstock-line subsystem 1200 may be constructed at a reduced cost. For example, combined partial-length-optical-waveguide additional-resin supply 1222 may spray or mist additional resin 125 and partial-length optical waveguides 122 together to apply them to elongate filaments 104, or elongate filaments 104 may be pulled through a bath of additional resin 125 with partial-length optical waveguides 122 suspended therein.
Referring generally to
As discussed, by imparting a first electrical charge to elongate filaments 104 or resin 124 and by imparting a second opposite charge to additional resin 125 as it is applied to elongate filaments 104 and resin 124, additional resin 125 will be electrostatically attracted to elongate filaments 104.
Referring generally to
Inclusion of optical direction-modifying particles 186 that at least one of reflect, refract, diffract, or Rayleigh-scatter electromagnetic radiation 118 provides for dispersion of electromagnetic radiation 118 within interior volume 182 for irradiation of resin 124 therein. Moreover, because they are particles, optical direction-modifying particles 186 more easily are positioned among elongate filaments 104 of a bundle, or tow, of elongate filaments 104. In addition, in some examples, they may be generally uniformly spaced throughout resin 124 within interior volume 182 and effectively scatter electromagnetic radiation 118 throughout interior volume 182 to penetrate among elongate filaments 104 and into the shadows cast by elongate filaments 104 when feedstock line 100 is being used to additively manufacture object 136 by system 700. In other examples, optical direction-modifying particles 186 may have a gradient of concentration within interior volume 182.
Optical direction-modifying particles 186 may be of any suitable material, such that they reflect, refract, diffract, or Rayleigh-scatter electromagnetic radiation 118. As illustrative, non-exclusive examples, optical direction-modifying particles 186 may be of alumina, silica, or thermoplastic with desired reflective, refractive, diffractive, or Rayleigh-scattering properties in connection with electromagnetic radiation 118.
In some examples of feedstock line 100, a single type, or configuration, of optical direction-modifying particles 186 may be included. In other examples of feedstock line 100, more than one type, or configuration, of optical direction-modifying particles 186 may be included, with different types being selected to accomplish different functions, and ultimately to collectively scatter electromagnetic radiation 118 evenly throughout interior volume 182, including into the shadows of elongate filaments 104. For example, a first type of optical direction-modifying particles 186 may be configured to reflect electromagnetic radiation 118, a second type of optical direction-modifying particles 186 may be configured to refract electromagnetic radiation 118, and a third type of optical direction-modifying particles 186 may be configured to diffract electromagnetic radiation 118.
Referring generally to
By having a maximum outer dimension that is less than one-eighth the minimum outer dimension of elongate filaments 104, optical direction-modifying particles 186 easily extend among elongate filaments 104. Moreover, when feedstock line 100 is being constructed (e.g., by dry-tow particle feedstock-line subsystem 1300 herein, by prepreg-tow particle feedstock-line subsystem 1400 herein, or according to method 800 herein), optical direction-modifying particles 186 may easily flow with resin 124 or additional resin 125 into a bundle, or tow, of elongate filaments 104.
Referring generally to
Typical reinforcement fibers for composite materials often have a diameter in the range of 5 to 8 microns. By having a maximum outer dimension that is less than 1000 nm (1 micron), 500 nm (0.5 micron), 250 nm (0.25 micron), or 200 nm (0.200 micron), optical direction-modifying particles 186 easily extend between typical sizes of elongate filaments 104. Moreover, when feedstock line 100 is being constructed (e.g., by dry-tow particle feedstock-line subsystem 1300 herein, by prepreg-tow particle feedstock-line subsystem 1400 herein, or according to method 800 herein), optical direction-modifying particles 186 may easily flow with resin 124 or additional resin 125 into a bundle, or tow, of elongate filaments 104.
Referring generally to
Selecting a minimum outer dimension of optical direction-modifying particles 186 that is greater than one-fourth the wavelength of electromagnetic radiation 118 ensures that optical direction-modifying particles 186 will have the intended effect of causing electromagnetic radiation 118 to reflect, refract, or diffract upon hitting optical direction-modifying particles 186.
Referring generally to
Ultra-violet light having a wavelength of about 400 nm is often used in connection with ultra-violet photopolymers. Accordingly, when resin 124 comprises or consists of a photopolymer, optical direction-modifying particles 186 having a minimum outer dimension that is greater than or equal to 100 nm ensures that optical direction-modifying particles 186 will have the intended effect of causing electromagnetic radiation 118 to reflect, refract, or diffract upon hitting optical direction-modifying particles 186. However, in other examples, a minimum outer dimension as low as 50 nm may be appropriate.
Referring generally to
By limiting optical direction-modifying particles 186 to the referenced threshold percentages, resin 124 will operatively flow among elongate filaments 104 when feedstock line 100 is being constructed (e.g., by dry-tow particle feedstock-line subsystem 1300 herein, by prepreg-tow particle feedstock-line subsystem 1400 herein, or according to method 800 herein). In addition, desired properties of resin 124, feedstock line 100, and ultimately object 136 will not be negatively impacted by the presence of optical direction-modifying particles 186.
Referring generally to
By being faceted, outer surfaces 184 effectively scatter electromagnetic radiation 118.
As used herein, “faceted” means having a plurality of planar, or generally planar, surfaces. In some examples of optical direction-modifying particles 186 that are faceted, outer surface 184 may have six or more, eight or more, ten or more, 100 or more, or even 1000 or more generally planar surfaces. Optical direction-modifying particles 186 may be of a material that has a natural crystalline structure that is faceted.
Referring generally to
Having a surface roughness selected to scatter electromagnetic radiation 118 facilitates the operative irradiation of resin 124 throughout interior volume 182, including into the shadows of elongate filaments 104.
Referring generally to
When optical direction-modifying particles 186 have a refractive index that is different from (e.g., that is at least 0.001 greater or less than) the refractive index of resin 124, electromagnetic radiation 118 incident upon the outer surfaces thereof will necessarily leave the outer surfaces at a different angle, and thus will scatter throughout resin 124, including into the shadows of elongate filaments 104.
Referring generally to
By being spherical, optical direction-modifying particles 186 may easily be positioned among elongate filaments 104, and when feedstock line 100 is being constructed (e.g., by dry-tow particle feedstock-line subsystem 1300 herein, by prepreg-tow particle feedstock-line subsystem 1400 herein, or according to method 800 herein), may easily flow with resin 124 or additional resin 125 into a bundle, or tow, of elongate filaments 104.
As used herein, “spherical” includes generally spherical and means that such optical direction-modifying particles 186 have a generally uniform aspect ratio, but are not necessarily perfectly spherical. For example, optical direction-modifying particles 186 that are spherical may be faceted, as discussed herein.
Referring generally to
By being prismatic, optical direction-modifying particles 186 may be selected to operatively at least one of reflect, refract, or diffract electromagnetic radiation 118, as discussed herein.
Referring generally to
As discussed, creating feedstock line 100 by system 700, as opposed to, for example, merely feeding feedstock line 100 from a pre-made supply of feedstock line 100, creates a versatile additive manufacturing system, in which the user may customize feedstock line 100 with desired properties. As also discussed, creating feedstock line 100 from precursor tow 208 permits the use of off-the-shelf reinforcement fiber tows. Filament separator 210 separates precursor tow 208 into individual ones of elongate filaments 104 or into subsets 214 of elongate filaments 104, so that optical direction-modifying particles 186 may be operatively interspersed with elongate filaments 104. Combiner 212 then combines elongate filaments 104 and optical direction-modifying particles 186 into derivative particle tow 1309 to ultimately become feedstock line 100 with resin 124. Resin supply 206 dispenses resin 124 at any suitable location as feedstock line 100 is being created, including one or more of (i) at precursor tow 208 before it is separated into individual ones of elongate filaments 104 or into subsets 214 of elongate filaments 104, (ii) at elongate filaments 104 that have been separated from precursor tow 208, (iii) at or with optical direction-modifying particles 186 before they are combined with elongate filaments 104, or (iv) at derivative particle tow 1309 after optical direction-modifying particles 186 have been combined with elongate filaments 104.
Combiner 212 may take any suitable configuration, such that it is configured to operatively combine elongate filaments 104 with optical direction-modifying particles 186, such that optical direction-modifying particles 186 become interspersed among elongate filaments 104. For example, combiner 212 may at least one of twist, weave, braid, or otherwise bundle elongate filaments 104 together with optical direction-modifying particles 186.
As discussed, resin supply 206 may take any suitable configuration, such that it is configured to operatively dispense and apply resin 124 at an operative location. For example, resin supply 206 may be configured to spray or mist resin 124. Additionally or alternatively, resin supply 206 may include a reservoir or bath of resin 124, through which is pulled at least one of precursor tow 208, individual ones of elongate filaments 104, subsets 214 of elongate filaments 104, or derivative particle tow 1309.
In some examples, dry-tow particle feedstock-line subsystem 1300 may further comprise chamber 224 between filament separator 210 and combiner 212, and through which individual ones of elongate filaments 104 or subsets 214 of elongate filaments 104 pass as feedstock line 100 is being created. Moreover, in some such examples, resin 124 is applied to at least elongate filaments 104, and in some examples, also to optical direction-modifying particles 186, in chamber 224.
Referring generally to
That is, combined particle resin supply 1322 may dispense optical direction-modifying particles 186 in a volume of resin 124. Stated differently, optical direction-modifying particles 186 may be suspended within resin 124. By using combined particle resin supply 1322, even dispersion of optical direction-modifying particles 186 may be ensured, and dry-tow particle feedstock-line subsystem 1300 may be constructed at a reduced cost. For example, combined particle resin supply 1322 may spray or mist resin 124 and optical direction-modifying particles 186 together to apply them to elongate filaments 104, or elongate filaments 104 may be pulled through a bath of resin 124 with optical direction-modifying particles 186 suspended therein.
Referring generally to
As discussed, by imparting a first electrical charge to elongate filaments 104 and by imparting a second opposite charge to resin 124 as it is applied to elongate filaments 104, resin 124 will be electrostatically attracted to elongate filaments 104, thereby facilitating wetting of elongate filaments 104 with resin 124.
Referring generally to
As discussed, creating feedstock line 100 by system 700, as opposed to, for example, merely feeding feedstock line 100 from a pre-made supply of feedstock line 100, creates a versatile additive manufacturing system, in which the user may customize feedstock line 100 with desired properties. As also discussed, creating feedstock line 100 from precursor prepreg tow 908 permits the use of off-the-shelf prepreg reinforcement fiber tows. Prepreg-tow separator 910 separates precursor prepreg tow 908 into individual ones of elongate filaments 104 that are at least partially covered with resin 124 or into subsets 214 of elongate filaments 104 that are at least partially covered with resin 124, so that optical direction-modifying particles 186 may be operatively interspersed with elongate filaments 104. Combiner 212 then combines elongate filaments 104 and optical direction-modifying particles 186, together with resin 124, into derivative particle prepreg tow 1409 to ultimately become feedstock line 100. At least one heater 220 heats resin 124 to facilitate one or both of separation of precursor prepreg tow 908 or wetting-out of elongate filaments 104 and optical direction-modifying particles 186 in derivative particle prepreg tow 1409.
As discussed, combiner 212 may take any suitable configuration, such that it is configured to operatively combine elongate filaments 104 with optical direction-modifying particles 186, such that optical direction-modifying particles 186 become interspersed among elongate filaments 104. When combiner 212 is a component of prepreg-tow particle feedstock-line subsystem 1400, combiner 212 also combines elongate filaments 104 with optical direction-modifying particles 186, such that elongate filaments 104 and optical direction-modifying particles 186 are at least partially covered by resin 124 in derivative particle prepreg tow 1409.
Referring generally to
By applying additional resin 125 to elongate filaments 104 and optical direction-modifying particles 186, full wet-out of elongate filaments 104 and optical direction-modifying particles 186 may be achieved in feedstock line 100.
As discussed, additional-resin supply 906 may take any suitable configuration, such that it is configured to operatively dispense and apply additional resin 125 at an operative location. For example, additional-resin supply 906 may be configured to spray or mist additional resin 125. Additionally or alternatively, additional-resin supply 906 may include a reservoir or bath of additional resin 125, through which is pulled at least one of precursor prepreg tow 908, individual ones of elongate filaments 104, subsets 214 of elongate filaments 104, or derivative particle prepreg tow 1409.
In some examples, additional resin 125 may be the same as resin 124. In other examples, additional resin 125 may be different from resin 124.
In some examples, prepreg-tow particle feedstock-line subsystem 1400 may further comprise chamber 224 between prepreg-tow separator 910 and combiner 212, and through which individual ones of elongate filaments 104 or subsets 214 of elongate filaments 104 pass as feedstock line 100 is being created. Moreover, in some such examples, additional resin 125 is applied to at least elongate filaments 104, and in some examples, also to optical direction-modifying particles 186, in chamber 224.
Referring generally to
That is, combined particle additional-resin supply 1422 may dispense optical direction-modifying particles 186 in a volume of additional resin 125. Stated differently, optical direction-modifying particles 186 may be suspended within additional resin 125. By using combined particle additional-resin supply 1422, even dispersion of optical direction-modifying particles 186 may be ensured, and prepreg-tow particle feedstock-line subsystem 1400 may be constructed at a reduced cost. For example, combined particle additional-resin supply 1422 may spray or mist additional resin 125 and optical direction-modifying particles 186 together to apply them to elongate filaments 104, or elongate filaments 104 may be pulled through a bath of additional resin 125 with optical direction-modifying particles 186 suspended therein.
Referring generally to
As discussed, by imparting a first electrical charge to elongate filaments 104 or resin 124 and by imparting a second opposite charge to additional resin 125 as it is applied to elongate filaments 104 and resin 124, additional resin 125 will be electrostatically attracted to elongate filaments 104.
Referring generally to
Drive assembly 710 facilitates the relative movement between delivery guide 704 and surface 708 so that object 136 is manufactured from feedstock line 100 as it is deposited via delivery guide 704.
Drive assembly 710 may take any suitable form, such that delivery guide 704 and surface 708 may be operatively moved relative to each other in three dimensions for additive manufacturing of object 136. In some examples, drive assembly 710 may be a robotic arm, and delivery guide 704 may be described as an end effector of the robotic arm. Drive assembly 710 may provide for relative movement between delivery guide 704 and surface 708 in any multiple degrees of freedom, including, for example, orthogonally in three dimensions relative to another, in three dimensions with at least three degrees of freedom relative to another, in three dimensions with at least six degrees of freedom relative to another, in three dimensions with at least nine degrees of freedom relative to another, and/or in three dimensions with at least twelve degrees of freedom relative to another.
Referring generally to, e.g.,
Method 800 therefore may be implemented to manufacture object 136 from a fiber reinforced composite material that facilitates in situ curing of resin 124. Moreover, method 800 may be implemented to manufacture object 136 with elongate filaments 104 being oriented in desired and/or predetermined orientations throughout object 136, such as to define desired properties of object 136. In addition and as discussed in connection with system 700 herein, inclusion of at least one optical modifier 123 in feedstock line 100 facilitates penetration of electromagnetic radiation 118 into interior volume 182 of feedstock line 100 for irradiation of resin 124, despite regions of resin 124 being in the shadows of elongate filaments 104 cast by the direct (i.e., line-of-sight) application of electromagnetic radiation 118. In other words, even when electromagnetic radiation 118 is shielded from directly reaching all regions of resin 124, at least one optical modifier 123 will redirect electromagnetic radiation 118 to indirectly reach regions of resin 124. As a result, feedstock line 100 may be more easily cured in situ with electromagnetic radiation 118, may be more evenly cured in situ with electromagnetic radiation 118, may be more thoroughly cured in situ with electromagnetic radiation 118, and/or may be more quickly cured in situ with electromagnetic radiation 118.
Referring generally to, e.g.,
As discussed, elongate filaments 104 typically will be selected for strength properties and not for light-transmissivity properties. For example, carbon fibers are often used in fiber-reinforced composite structures, and carbon fibers are opaque to ultra-violet and visible light. Accordingly, elongate filaments 104 that are opaque to electromagnetic radiation 118 are well suited for inclusion in feedstock line 100, as at least one optical modifier 123 operatively will redirect electromagnetic radiation 118 into the shadows of elongate filaments 104.
Referring generally to, e.g.,
As discussed, inclusion of at least one full-length optical waveguide 102 in feedstock line 100 facilitates penetration of electromagnetic radiation 118 into interior volume 182 of feedstock line 100 for irradiation of resin 124, despite regions of resin 124 being in the shadows of elongate filaments 104. More specifically, even when electromagnetic radiation 118 is shielded from directly reaching all regions of resin 124, at least one full-length optical waveguide 102 will receive electromagnetic radiation 118 via one or more of its first full-length-optical-core end face 112, its second full-length-optical-core end face 114, or its full-length peripheral surface 116, and disperse electromagnetic radiation 118 via at least its full-length peripheral surface 116 to indirectly reach regions of resin 124.
Referring generally to, e.g.,
In other words, when electromagnetic radiation 118 enters first full-length-optical-core end face 112, it will exit both full-length peripheral surface 116 and second full-length-optical-core end face 114, as opposed, for example, to electromagnetic radiation 118 being fully emitted via full-length peripheral surface 116. Accordingly, it is ensured that electromagnetic radiation 118 travels through a substantial portion of full-length optical core 110, effectively leaking electromagnetic radiation 118 along the way and thereby penetrating multiple regions of resin 124 of feedstock line 100.
Referring generally to, e.g.,
Accordingly, it is ensured that a desired amount of electromagnetic radiation 118 exits full-length optical core 110 via full-length peripheral surface 116 to operatively cure resin 124 among elongate filaments 104 within interior volume 182 of feedstock line 100, as opposed to, for example, excessive amounts of electromagnetic radiation 118 traveling all the way to second full-length-optical-core end face 114 and not operatively penetrating a desired volume of resin 124 within feedstock line 100.
Referring generally to, e.g.,
As discussed, by at least one full-length optical waveguide 102 being generally parallel to elongate filaments 104, the reinforcing properties of elongate filaments 104 within feedstock line 100, and thus within object 136 are not materially affected. By being twisted with, woven with, or braided with elongate filaments 104, at least one full-length optical waveguide 102 is interspersed with elongate filaments 104 so that electromagnetic radiation 118, exiting at least one full-length optical waveguide 102, is delivered to regions of interior volume 182 that are in the shadows of elongated filaments 104.
Referring generally to, e.g.,
As discussed, by full-length-optical-core cladding 154 being non-uniform along the length of the full-length optical waveguide, electromagnetic radiation 118 is permitted to exit full-length optical core 110 via full-length peripheral surface 116. Moreover, by first full-length-optical-core cladding resin 156 having a refractive index that is lower than that of full-length optical core 110, electromagnetic radiation 118, upon entering full-length optical core 110, is trapped within full-length optical core 110 other than the regions where first full-length-optical-core cladding resin 156 is not present. As a result, at least one full-length optical waveguide 102 may be constructed to provide a desired amount of electromagnetic radiation 118, exiting various positions along full-length peripheral surface 116, such as to ensure a desired amount of electromagnetic radiation 118, penetrating the shadows of elongate filaments 104.
Referring generally to, e.g.,
As discussed, by covering full-length-peripheral-surface regions 127 with second full-length-optical-core cladding resin 158, a desired refractive index thereof may be selected to optimize how electromagnetic radiation 118 exits full-length peripheral surface 116. Additionally or alternatively, with full-length-peripheral-surface regions 127 covered with second full-length-optical-core cladding resin 158, the integrity of first full-length-optical-core cladding resin 156 may be ensured, such that it does not peel or break off during storage and handling of feedstock line 100.
Referring generally to, e.g.,
As discussed, such full-length optical waveguides may be more easily manufactured, in that full-length optical core 110 with first full-length-optical-core cladding resin 156 simply may be fully coated with second full-length-optical-core cladding resin 158. Additionally or alternatively, the integrity of full-length optical waveguides may be maintained during storage thereof, as well as during construction and storage of feedstock line 100.
Referring generally to, e.g.,
As discussed, because second full-length-optical-core cladding resin 158 has a refractive index that is lower than that of resin 124, electromagnetic radiation 118 will be permitted to exit second full-length-optical-core cladding resin 158 to penetrate and cure resin 124.
Referring generally to, e.g.,
As discussed, rather than relying on refractive-index properties of a cladding to ensure desired dispersal of electromagnetic radiation 118 from full-length optical core 110 via full-length peripheral surface 116, the surface roughness of full-length peripheral surface 116 is selected such that electromagnetic radiation 118 exits full-length optical core 110 at desired amounts along the length of full-length peripheral surface 116. For example, the surface roughness may create regions of internal reflection of electromagnetic radiation 118 within full-length optical core 110 and may create regions where electromagnetic radiation 118 is permitted to escape full-length optical core 110.
Referring generally to, e.g.,
As discussed, full-length optical waveguides without any cladding may be less expensive to manufacture than full-length optical waveguides with cladding. Additionally, the difference of refractive indexes between a cladding and resin 124 need not be taken into account when selecting resin 124 for feedstock line 100.
Referring generally to, e.g.,
As disused, by including a plurality of full-length optical waveguides, interspersed among elongate filaments 104, such as among a bundle, or tow, of elongate filaments, a desired penetration of electromagnetic radiation 118 into the shadows of elongate filaments 104 is be ensured.
Referring generally to, e.g.,
As discussed, by being twisted with, woven with, or braided with elongate filaments 104, the plurality of full-length optical waveguides is interspersed with elongate filaments 104 so that electromagnetic radiation 118, exiting the full-length optical waveguides, is delivered to regions of interior volume 182 that are in the shadows of elongated filaments 104.
Referring generally to, e.g.,
As discussed in connection with dry-tow full-length-optical-waveguide feedstock-line subsystem 200 of system 700, creating feedstock line 100 from precursor tow 208 permits the use of off-the-shelf reinforcement fiber tows. By separating precursor tow 208 into individual ones of elongate filaments 104 or into subsets 214 of elongate filaments 104, at least one full-length optical waveguide 102 may be operatively interspersed with elongate filaments 104. Covering elongate filaments 104 and full-length optical waveguide 102 with resin 124 ensures that elongate filaments 104 and full-length optical waveguide 102 are wetted and have suitable integrity for additively manufacturing object 136.
Referring generally to, e.g.,
In some implementations of method 800, applying resin 124 before precursor tow 208 is separated enables a corresponding system (e.g., system 700 herein and dry-two full-length-optical-waveguide feedstock-line subsystem 200 thereof) to regulate the amount of resin 124 on each individual one of elongate filaments 104 or individual subsets 214 of elongate filaments 104. For example, when a screen or mesh is used to separate precursor tow 208, the screen or mesh may effectively scrape away excess resin 124 leaving only a desired amount on each individual one of elongate filaments 104 or individual subsets 214 of elongate filaments 104 for subsequent combination with full-length optical waveguide(s) to create feedstock line 100.
On the other hand, in some implementations of method 800, applying resin 124 after precursor tow 208 is separated enables a sufficient amount of resin 124 to fully wet elongate filaments 104 and full-length optical waveguide(s).
In some implementations of method 800, resin 124 may be applied both before and after precursor tow 208 is separated.
Referring generally to, e.g.,
In some implementations of method 800, applying resin 124 before elongate filaments 104 and at least one full-length optical waveguide 102 are combined enables a sufficient amount of resin 124 to fully wet elongate filaments 104 and full-length optical waveguide(s).
In some implementations of method 800, applying resin 124 after elongate filaments 104 and full-length optical waveguide(s) are combined into derivative full-length-optical-waveguide tow 209 ensures that feedstock line 100 has the overall desired amount of resin 124 therein.
In some implementations of method 800, resin 124 may be applied both before and after elongate filaments 104 and full-length optical waveguide(s) are combined.
Referring generally to, e.g.,
As discussed in connection with system 700, by imparting a first electrical charge to elongate filaments 104 and by imparting a second opposite charge to resin 124 as it is applied to elongate filaments 104, resin 124 will be electrostatically attracted to elongate filaments 104, thereby facilitating wetting of elongate filaments 104 with resin 124.
Referring generally to, e.g.,
Again, by being twisted with, woven with, or braided with elongate filaments 104, at least one full-length optical waveguide 102 is interspersed with elongate filaments 104 so that electromagnetic radiation 118, exiting at least one full-length optical waveguide 102, is delivered to regions of interior volume 182 that are in the shadows of elongated filaments 104.
Referring generally to, e.g.,
As discussed in connection with prepreg-tow full-length-optical-waveguide feedstock-line subsystem 900 of system 700, creating feedstock line 100 from precursor prepreg tow 908 permits the use of off-the-shelf prepreg reinforcement fiber tows. By separating precursor prepreg tow 908 into individual ones of elongate filaments 104 or into subsets 214 of elongate filaments 104, at least one full-length optical waveguide 102 may be operatively interspersed with elongate filaments 104. Heating resin 124 facilitates one or both of separation of precursor prepreg tow 908 or wetting-out of elongate filaments 104 and at least one full-length optical waveguide 102 in derivative full-length-optical-waveguide prepreg tow 909.
Referring generally to, e.g.,
As discussed, by applying additional resin 125 to elongate filaments 104 and full-length optical waveguide(s), full wet-out of elongate filaments 104 and full-length optical waveguide(s) may be achieved in feedstock line 100.
Referring generally to, e.g.,
In some implementations of method 800, applying additional resin 125 before precursor prepreg tow 908 is separated enables a corresponding system (e.g., system 700 herein and prepreg-tow full-length-optical-waveguide feedstock-line subsystem 900 thereof) to regulate the amount of additional resin 125 on each individual one of elongate filaments 104 or individual subsets 214 of elongate filaments 104. For example, when a screen or mesh is used to separate precursor prepreg tow 908, the screen or mesh may effectively scrape away excess resin 124 and additional resin 125 leaving only a desired amount on each individual one of elongate filaments 104 or individual subsets 214 of elongate filaments 104 for subsequent combination with full-length optical waveguide(s) to create feedstock line 100.
On the other hand, in some implementations of method 800, applying additional resin 125 after precursor prepreg tow 908 is separated enables a sufficient amount of additional resin 125 to fully wet, with resin 124, elongate filaments 104 and full-length optical waveguide(s).
In some implementations of method 800, additional resin 125 may be applied both before and after precursor prepreg tow 908 is separated.
Referring generally to, e.g.,
In some implementations of method 800, applying additional resin 125 before elongate filaments 104 and at least one full-length optical waveguide 102 are combined enables a sufficient amount of resin 124 and additional resin 125 to fully wet elongate filaments 104 and full-length optical waveguide(s).
In some implementations of method 800, applying additional resin 125 after elongate filaments 104 and full-length optical waveguide(s) are combined into derivative full-length-optical-waveguide prepreg tow 909 ensures that feedstock line 100 has the overall desired amount of resin 124 and additional resin 125 therein.
In some implementations of method 800, additional resin 125 may be applied both before and after elongate filaments 104 and full-length optical waveguide(s) are combined.
Referring generally to, e.g.,
As discussed in connection with prepreg-tow full-length-optical-waveguide feedstock-line subsystem 900 of system 700, by imparting a first electrical charge to elongate filaments 104 or resin 124 and by imparting a second opposite charge to additional resin 125 as it is applied to elongate filaments 104 and resin 124, additional resin 125 will be electrostatically attracted to elongate filaments 104.
Referring generally to, e.g.,
Again, by being twisted with, woven with, or braided with elongate filaments 104, at least one full-length optical waveguide 102 is interspersed with elongate filaments 104 so that electromagnetic radiation 118, exiting at least one full-length optical waveguide 102, is delivered to regions of interior volume 182 that are in the shadows of elongate filaments 104.
Referring generally to, e.g.,
As discussed, partial-length optical waveguides 122 may be cost effective to create, such as according to the various methods disclosed herein. Moreover, by being interspersed among elongate filaments 104, partial-length optical waveguides 122 may directly receive electromagnetic radiation 118 and deliver electromagnetic radiation 118 into the shadows of elongate filaments 104.
Referring generally to, e.g.,
As discussed, by being non-uniform along the length of partial-length optical waveguides 122, electromagnetic radiation 118 is permitted to exit partial-length optical core 138 via partial-length peripheral surface 144. Moreover, by first partial-length-optical-core cladding resin 162 having a refractive index that is lower than that of partial-length optical core 138, electromagnetic radiation 118, upon entering partial-length optical core 138, is trapped within partial-length optical core 138 other than the regions where first partial-length-optical-core cladding resin 162 is not present. As a result, partial-length optical waveguides 122 may be constructed to provide a desired amount of electromagnetic radiation 118, exiting various positions along partial-length peripheral surface 144, such as to ensure a desired amount of electromagnetic radiation 118, penetrating the shadows of elongate filaments 104.
Referring generally to, e.g.,
As discussed, by covering partial-length-peripheral-surface regions 129 with second partial-length-optical-core cladding resin 164, a desired refractive index thereof may be selected to optimize how electromagnetic radiation 118 exits partial-length peripheral surface 144. Additionally or alternatively, with partial-length-peripheral-surface regions 129 covered with second partial-length-optical-core cladding resin 164, the integrity of first partial-length-optical-core cladding resin 162 may be ensured, such that it does not peel or break off during storage of partial-length optical waveguides 122 or during construction and use of feedstock line 100.
Referring generally to, e.g.,
As discussed, such partial-length optical waveguides 122 may be more easily manufactured, in that partial-length optical core 138 with first partial-length-optical-core cladding resin 162 simply may be fully coated with second partial-length-optical-core cladding resin 164. Additionally or alternatively, the integrity of partial-length optical waveguides 122 may be maintained during storage thereof and during construction and use of feedstock line 100.
Referring generally to, e.g.,
As discussed, because second partial-length-optical-core cladding resin 164 has a refractive index that is lower than that of resin 124, electromagnetic radiation 118 exits second partial-length-optical-core cladding resin 164 to penetrate and cure resin 124.
Referring generally to, e.g.,
As discussed, rather than relying on refractive-index properties of a cladding to ensure desired dispersal of electromagnetic radiation 118 from partial-length optical core 138 via partial-length peripheral surface 144, the surface roughness of partial-length peripheral surface 144 results in electromagnetic radiation 118 exiting partial-length optical core 138 at desired amounts along the length of partial-length peripheral surface 144. For example, the surface roughness creates regions of internal reflection of electromagnetic radiation 118 within partial-length optical core 138 and creates regions where electromagnetic radiation 118 escapes partial-length optical core 138.
Referring generally to, e.g.,
As discussed, partial-length optical waveguides 122 without any cladding may be less expensive to manufacture than partial-length optical waveguides 122 with cladding. Additionally, the difference of refractive indexes between a cladding and resin 124 need not be taken into account when selecting resin 124 for feedstock line 100.
Referring generally to, e.g.,
As discussed in connection with dry-tow partial-length-optical-waveguide feedstock-line subsystem 1000 of system 700, creating feedstock line 100 from precursor tow 208 permits the use of off-the-shelf reinforcement fiber tows. By separating precursor tow 208 into individual ones of elongate filaments 104 or into subsets 214 of elongate filaments 104, partial-length optical waveguides 122 may be operatively interspersed with elongate filaments 104. Covering elongate filaments 104 and partial-length optical waveguides 122 with resin 124 ensures that elongate filaments 104 and partial-length optical waveguides 122 are wetted and have suitable integrity for additively manufacturing object 136.
Referring generally to, e.g.,
In some implementations of method 800, applying resin 124 before precursor tow 208 is separated enables a corresponding system (e.g., system 700 herein and dry-tow partial-length-optical-waveguide feedstock-line subsystem 1000 thereof) to regulate the amount of resin 124 on each individual one of elongate filaments 104 or individual subsets 214 of elongate filaments 104. For example, when a screen or mesh is used to separate precursor tow 208, the screen or mesh may effectively scrape away excess resin 124 leaving only a desired amount on each individual one of elongate filaments 104 or individual subsets 214 of elongate filaments 104 for subsequent combination with partial-length optical waveguides 122 to create feedstock line 100.
On the other hand, in some implementations of method 800, applying resin 124 after precursor tow 208 is separated enables a sufficient amount of resin 124 to fully wet elongate filaments 104 and partial-length optical waveguides 122.
In some implementations of method 800, resin 124 may be applied both before and after precursor tow 208 is separated.
Referring generally to, e.g.,
In some implementations of method 800, applying resin 124 before elongate filaments 104 and partial-length optical waveguides 122 are combined enables a sufficient amount of resin 124 to fully wet elongate filaments 104 and partial-length optical waveguides 122.
In some implementations of method 800, applying resin 124 after elongate filaments 104 and partial-length optical waveguides 122 are combined into derivative partial-length-optical-waveguide tow 1009 ensures that feedstock line 100 has the overall desired amount of resin 124 therein.
In some implementations of method 800, resin 124 may be applied both before and after elongate filaments 104 and partial-length optical waveguides 122 are combined.
Referring generally to, e.g.,
As discussed in connection with dry-tow partial-length-optical-waveguide feedstock-line subsystem 1000 thereof, by imparting a first electrical charge to elongate filaments 104 and by imparting a second opposite charge to resin 124 as it is applied to elongate filaments 104, resin 124 will be electrostatically attracted to elongate filaments 104, thereby facilitating wetting of elongate filaments 104 with resin 124.
Referring generally to, e.g.,
As discussed in connection with prepreg-tow partial-length-optical-waveguide feedstock-line subsystem 1200 of system 700, creating feedstock line 100 from precursor prepreg tow 908 permits the use of off-the-shelf prepreg reinforcement fiber tows. By separating precursor prepreg tow 908 into individual ones of elongate filaments 104 or into subsets 214 of elongate filaments 104, partial-length optical waveguides 122 may be operatively interspersed with elongate filaments 104. Heating resin 124 facilitates one or both of separation of precursor prepreg tow 908 or wetting-out of elongate filaments 104 and partial-length optical waveguides 122 in derivative partial-length-optical-waveguide prepreg tow 1209.
Referring generally to, e.g.,
As discussed, by applying additional resin 125 to elongate filaments 104 and partial-length optical waveguides 122, full wet-out of elongate filaments 104 and partial-length optical waveguides 122 may be achieved in feedstock line 100.
Referring generally to, e.g.,
In some implementations of method 800, applying additional resin 125 before precursor prepreg tow 908 is separated enables a corresponding system (e.g., system 700 herein and prepreg-tow partial-length-optical-waveguide feedstock-line subsystem 1200 thereof) to regulate the amount of additional resin 125 on each individual one of elongate filaments 104 or individual subsets 214 of elongate filaments 104. For example, when a screen or mesh is used to separate precursor prepreg tow 908, the screen or mesh may effectively scrape away excess resin 124 and additional resin 125 leaving only a desired amount on each individual one of elongate filaments 104 or individual subsets 214 of elongate filaments 104 for subsequent combination with partial-length optical waveguides 122 to create feedstock line 100.
On the other hand, in some implementations of method 800, applying additional resin 125 after precursor prepreg tow 908 is separated enables a sufficient amount of additional resin 125 to fully wet, with resin 124, elongate filaments 104 and partial-length optical waveguides 122.
In some implementations of method 800, additional resin 125 may be applied both before and after precursor prepreg tow 908 is separated.
Referring generally to, e.g.,
In some implementations of method 800, applying additional resin 125 before elongate filaments 104 and partial-length optical waveguides 122 are combined enables a sufficient amount of resin 124 and additional resin 125 to fully wet elongate filaments 104 and partial-length optical waveguides 122.
In some implementations of method 800, applying additional resin 125 after elongate filaments 104 and partial-length optical waveguides 122 are combined into derivative partial-length-optical-waveguide prepreg tow 1209 ensures that feedstock line 100 has the overall desired amount of resin 124 and additional resin 125 therein.
In some implementations of method 800, additional resin 125 may be applied both before and after elongate filaments 104 and partial-length optical waveguides 122 are combined.
Referring generally to, e.g.,
As discussed in connection with prepreg-tow partial-length-optical-waveguide feedstock-line subsystem 1200 of system 700, by imparting a first electrical charge to elongate filaments 104 or resin 124 and by imparting a second opposite charge to additional resin 125 as it is applied to elongate filaments 104 and resin 124, additional resin 125 will be electrostatically attracted to elongate filaments 104.
Referring generally to, e.g.,
As discussed in connection with system 700, inclusion of optical direction-modifying particles 186 that at least one of reflect, refract, diffract, or Rayleigh-scatter electromagnetic radiation 118 facilitates dispersion of electromagnetic radiation 118 within interior volume 182 for irradiation of resin 124 therein.
Referring generally to, e.g.,
As discussed, by having a maximum outer dimension that is less than one-eighth the minimum outer dimension of elongate filaments 104, optical direction-modifying particles 186 easily extend among elongate filaments 104. Moreover, when feedstock line 100 is being constructed, optical direction-modifying particles 186 may easily flow with resin 124 or additional resin 125 into a bundle, or tow, of elongate filaments 104.
Referring generally to, e.g.,
As discussed, by having a maximum outer dimension that is less than 1000 nm (1 micron), 500 nm (0.5 micron), 250 nm (0.25 micron), or 200 nm (0.200 micron), optical direction-modifying particles 186 easily extend between typical sizes of elongate filaments 104. Moreover, when feedstock line 100 is being constructed, optical direction-modifying particles 186 may easily flow with resin 124 or additional resin 125 into a bundle, or tow, of elongate filaments 104.
Referring generally to, e.g.,
As discussed, selecting a minimum outer dimension of optical direction-modifying particles 186 that is greater than one-fourth the wavelength of electromagnetic radiation 118 ensures that optical direction-modifying particles 186 will cause electromagnetic radiation 118 to reflect, refract, or diffract upon hitting optical direction-modifying particles 186.
Referring generally to, e.g.,
As discussed, ultra-violet light having a wavelength of about 400 nm is often used in connection with ultra-violet photopolymers. Accordingly, when resin 124 comprises or consists of a photopolymer, optical direction-modifying particles 186 having a minimum outer dimension that is greater than or equal to 100 nm ensures that optical direction-modifying particles 186 cause electromagnetic radiation 118 to reflect, refract, or diffract upon hitting optical direction-modifying particles 186.
Referring generally to, e.g.,
As discussed, by limiting optical direction-modifying particles 186 to the referenced threshold percentages, resin 124 will operatively flow among elongate filaments 104 when feedstock line 100 is being constructed. In addition, desired properties of resin 124, feedstock line 100, and ultimately object 136 will not be negatively impacted by the presence of optical direction-modifying particles 186.
Referring generally to, e.g.,
As discussed, by being faceted, outer surfaces 184 effectively scatter electromagnetic radiation 118.
Referring generally to, e.g.,
As discussed, having a surface roughness selected to scatter electromagnetic radiation 118 facilitates the operative irradiation of resin 124 throughout interior volume 182, including into the shadows of elongate filaments 104.
Referring generally to, e.g.,
As discussed, when optical direction-modifying particles 186 have a refractive index that is different from (e.g., that is at least 0.001 greater or less than) the refractive index of resin 124, electromagnetic radiation 118 incident upon the outer surfaces thereof will necessarily leave the outer surfaces at a different angle, and thus will scatter throughout resin 124, including into the shadows of elongate filaments 104.
Referring generally to, e.g.,
As discussed, by being spherical, optical direction-modifying particles 186, when feedstock line 100 is being constructed, may easily flow with resin 124 or additional resin 125 into a bundle, or tow, of elongate filaments 104.
Referring generally to, e.g.,
As discussed, by being prismatic, optical direction-modifying particles 186 may be selected to operatively at least one of reflect, refract, or diffract electromagnetic radiation 118.
Referring generally to, e.g.,
As discussed in connection with dry-tow particle feedstock-line subsystem 1300 of system 700, creating feedstock line 100 from precursor tow 208 permits the use of off-the-shelf reinforcement fiber tows. By separating precursor tow 208 into individual ones of elongate filaments 104 or into subsets 214 of elongate filaments 104, optical direction-modifying particles 186 may be operatively interspersed with elongate filaments 104. Covering elongate filaments 104 and optical direction-modifying particles 186 with resin 124 ensures that elongate filaments 104 and optical direction-modifying particles 186 are wetted and have suitable integrity for additively manufacturing object 136.
Referring generally to, e.g.,
In some implementations of method 800, applying resin 124 before precursor tow 208 is separated enables a corresponding system (e.g., system 700 herein and dry-tow particle feedstock-line subsystem 1300 thereof) to regulate the amount of resin 124 on each individual one of elongate filaments 104 or individual subsets 214 of elongate filaments 104. For example, when a screen or mesh is used to separate precursor tow 208, the screen or mesh may effectively scrape away excess resin 124 leaving only a desired amount on each individual one of elongate filaments 104 or individual subsets 214 of elongate filaments 104 for subsequent combination with optical direction-modifying particles 186 to create feedstock line 100.
On the other hand, in some implementations of method 800, applying resin 124 after precursor tow 208 is separated enables a sufficient amount of resin 124 to fully wet elongate filaments 104 and optical direction-modifying particles 186.
In some implementations of method 800, resin 124 may be applied both before and after precursor tow 208 is separated.
Referring generally to, e.g.,
In some implementations of method 800, applying resin 124 before elongate filaments 104 and optical direction-modifying particles 186 are combined enables a sufficient amount of resin 124 to fully wet elongate filaments 104 and optical direction-modifying particles 186.
In some implementations of method 800, applying resin 124 after elongate filaments 104 and optical direction-modifying particles 186 are combined into derivative particle tow 1309 ensures that feedstock line 100 has the overall desired amount of resin 124 therein.
In some implementations of method 800, resin 124 may be applied both before and after elongate filaments 104 and optical direction-modifying particles 186 are combined.
Referring generally to, e.g.,
As discussed in connection with dry-tow particle feedstock-line subsystem 1300, by imparting a first electrical charge to elongate filaments 104 and by imparting a second opposite charge to resin 124 as it is applied to elongate filaments 104, resin 124 will be electrostatically attracted to elongate filaments 104, thereby facilitating wetting of elongate filaments 104 with resin 124.
Referring generally to, e.g.,
As discussed in connection with prepreg-tow particle feedstock-line subsystem 1400 of system 700, creating feedstock line 100 from precursor prepreg tow 908 permits the use of off-the-shelf prepreg reinforcement fiber tows. By separating precursor prepreg tow 908 into individual ones of elongate filaments 104 or into subsets 214 of elongate filaments 104, optical direction-modifying particles 186 may be operatively interspersed with elongate filaments 104. Heating resin 124 facilitates one or both of separation of precursor prepreg tow 908 or wetting-out of elongate filaments 104 and optical direction-modifying particles 186 in derivative particle prepreg tow 1409.
Referring generally to, e.g.,
As discussed, by applying additional resin 125 to elongate filaments 104 and optical direction-modifying particles 186, full wet-out of elongate filaments 104 and optical direction-modifying particles 186 may be achieved in feedstock line 100.
Referring generally to, e.g.,
In some implementations of method 800, applying additional resin 125 before precursor prepreg tow 908 is separated enables a corresponding system (e.g., system 700 herein and prepreg-tow particle feedstock-line subsystem 1400 thereof) to regulate the amount of additional resin 125 on each individual one of elongate filaments 104 or individual subsets 214 of elongate filaments 104. For example, when a screen or mesh is used to separate precursor prepreg tow 908, the screen or mesh may effectively scrape away excess resin 124 and additional resin 125 leaving only a desired amount on each individual one of elongate filaments 104 or individual subsets 214 of elongate filaments 104 for subsequent combination with optical direction-modifying particles 186 to create feedstock line 100.
On the other hand, in some implementations of method 800, applying additional resin 125 after precursor prepreg tow 908 is separated enables a sufficient amount of additional resin 125 to fully wet, with resin 124, elongate filaments 104 and optical direction-modifying particles 186.
In some implementations of method 800, additional resin 125 may be applied both before and after precursor prepreg tow 908 is separated.
Referring generally to, e.g.,
In some implementations of method 800, applying additional resin 125 before elongate filaments 104 and optical direction-modifying particles 186 are combined enables a sufficient amount of resin 124 and additional resin 125 to fully wet elongate filaments 104 and optical direction-modifying particles 186.
In some implementations of method 800, applying additional resin 125 after elongate filaments 104 and optical direction-modifying particles 186 are combined into derivative particle prepreg tow 1409 ensures that feedstock line 100 has the overall desired amount of resin 124 and additional resin 125 therein.
In some implementations of method 800, additional resin 125 may be applied both before and after elongate filaments 104 and optical direction-modifying particles 186 are combined.
Referring generally to, e.g.,
As discussed in connection with prepreg-tow particle feedstock-line subsystem 1400 of system 700, by imparting a first electrical charge to elongate filaments 104 or resin 124 and by imparting a second opposite charge to additional resin 125 as it is applied to elongate filaments 104 and resin 124, additional resin 125 will be electrostatically attracted to elongate filaments 104.
Referring generally to
Because optical waveguide 108 is configured for electromagnetic radiation to enter optical core 146 via any one of first end face 148, second end face 150, or peripheral surface 152 and then exit optical core 146 via peripheral surface 152, optical waveguide 108 is well suited for inclusion in a photopolymer resin (e.g., resin 124 herein) of a feedstock line (e.g., feedstock line 100 here) that also includes reinforcing fibers (e.g., elongate filaments 104 herein) and that is used to additively manufacture an object (e.g., object 136 herein by system 700 herein or according to method 800 herein). More specifically, inclusion of at least one optical waveguide 108 in such a feedstock line facilitates penetration of electromagnetic radiation 118 into the interior volume of the feedstock line for irradiation of the resin, despite regions of the resin being in the shadows of the reinforcing fibers cast by the direct (i.e., line-of-sight) application of electromagnetic radiation 118. In other words, even when electromagnetic radiation 118 is shielded from directly reaching all regions of the resin, at least one optical waveguide 108 will receive electromagnetic radiation 118 via one or more of first end face 148, second end face 150, or peripheral surface 152, and disperse electromagnetic radiation 118 via at least peripheral surface 152 to indirectly reach regions of the resin. As a result, the feedstock line may be more easily cured with electromagnetic radiation 118, may be more evenly cured with electromagnetic radiation 118, may be more thoroughly cured with electromagnetic radiation 118, and/or may be more quickly cured with electromagnetic radiation 118. Such a configuration of feedstock line is particularly well suited for additive manufacturing of the fused filament fabrication variety (e.g., by system 700 herein or according to method 800 herein), in which the feedstock line is dispensed by a print head, or nozzle (e.g., delivery guide 704 herein), and a source of curing energy (e.g., curing mechanism 706 herein) directs the curing energy at the feedstock line as it is being dispensed to cure the resin in situ.
Full-length optical waveguides and partial-length optical waveguides are examples of optical waveguides, such as optical waveguide 108.
Referring generally to
That is, when electromagnetic radiation 118 enters first end face 148, it will exit both peripheral surface 152 and second end face 150, as opposed, for example, to electromagnetic radiation 118 being fully emitted via peripheral surface 152. Such examples of optical waveguide 108 are well suited for inclusion in feedstock lines with additive manufacturing systems and methods in which electromagnetic radiation 118 is directed at first end face 148 as the feedstock line is being constructed and as an object is being manufactured. That is, an additive manufacturing system may be configured to construct a feedstock line while the object is being manufactured from the feedstock line, and while electromagnetic radiation 118 is entering first end face 148. Because electromagnetic radiation 118 exits not only peripheral surface 152, but also second end face 150, it is ensured that sufficient electromagnetic radiation 118 travels the full length of optical waveguide 108 to operatively cure the resin of the feedstock line that is in the shadows of the reinforcing fibers.
Referring generally to
In such configurations, it is ensured that a desired amount of electromagnetic radiation 118 exits optical core 146 via peripheral surface 152 to operatively cure the resin of a feedstock line that is in the shadows of the reinforcing fibers, when the feedstock line is utilized by an additive manufacturing system or in an additive manufacturing method.
Referring generally to
By cladding 120 being non-uniform along the length of optical waveguide 108, electromagnetic radiation 118 is permitted to exit optical core 146 via peripheral surface 152. Moreover, by first resin 132 having a refractive index that is lower than that of optical core 146, electromagnetic radiation 118, upon entering optical core 146, is trapped within optical core 146 other than the regions where first resin 132 is not present. As a result, optical waveguide 108 may be constructed to provide a desired amount of electromagnetic radiation 118, exiting various positions along peripheral surface 152, such as to ensure a desired amount of electromagnetic radiation 118, penetrating the shadows of reinforcing fibers when optical waveguide 108 is included in a feedstock line that is used to additively manufacture an object.
Referring generally to
By covering regions 130 with second resin 134, a desired refractive index thereof may be selected to optimize how electromagnetic radiation 118 exits peripheral surface 152. Additionally or alternatively, with regions 130 covered with second resin 134, the integrity of first resin 132 may be ensured, such that it does not peel or break off during storage of optical waveguide 108 and during construction of an associated feedstock line.
Referring generally to
Optical waveguides, such as optical waveguide 108, may be more easily manufactured, in that optical core 146 with first resin 132 simply may be fully coated with second resin 134. Additionally or alternatively, the integrity of optical waveguides may be maintained during storage thereof and during construction of an associated feedstock line.
Referring generally to
Rather than relying on refractive index properties of a cladding to ensure desired dispersal of electromagnetic radiation 118 from optical core 146 via peripheral surface 152, the surface roughness of peripheral surface 152 is selected such that electromagnetic radiation 118 exits optical core 146 at desired amounts along the length of peripheral surface 152. For example, the surface roughness may create regions of internal reflection of electromagnetic radiation 118 within optical core 146 and may create regions where electromagnetic radiation 118 is permitted to escape optical core 146.
Referring generally to
Optical waveguides without any cladding may be less expensive to manufacture than optical waveguides with cladding. Additionally, the difference of refractive indexes between a cladding and a resin of a feedstock line need not be taken into account when selecting the resin for the feedstock line.
Referring generally to, e.g.,
Method 400 provides an inexpensive process for creating optical waveguide 108. For example, an off-the-shelf cladded optical fiber may be used as optical fiber 126, and portions 128 of cladding 120 simply may be removed at regions 130 that are appropriately spaced apart to result in the desired functions of optical waveguide 108, discussed herein.
Any suitable process may be utilized to remove portion 128 of cladding 120, including, for example, mechanical processes, chemical processes, thermal processes (e.g., utilizing a laser), etc.
Referring generally to, e.g.,
As discussed, by covering regions 130 with second resin 134, a desired refractive index thereof may be selected to optimize how electromagnetic radiation 118 exits peripheral surface 152. Additionally or alternatively, with regions 130 covered with second resin 134, the integrity of first resin 132 may be ensured, such that it does not peel or break off during storage of optical waveguide 108 and during construction of an associated feedstock line.
Referring generally to, e.g.,
Applying second resin 134 such that it also covers first resin 132 may be an easier and less-expensive process than applying second resin 134 only to contact and cover regions 130.
Referring generally to, e.g.,
Method 500 provides an inexpensive process for creating optical waveguide 108. For example, an off-the-shelf non-cladded optical fiber may be used as optical core 146, and first resin 132 may be applied to peripheral surface 152 thereof.
Any suitable process for applying first resin 132 may be used, including, for example spraying, misting, or splattering first resin 132 on peripheral surface 152, such that regions 130 of peripheral surface 152 remain uncovered by first resin 132.
Referring generally to, e.g.,
Similar to method 400, by covering regions 130 with second resin 134, a desired refractive index thereof may be selected to optimize how electromagnetic radiation 118 exits peripheral surface 152. Additionally or alternatively, with regions 130 covered with second resin 134, the integrity of first resin 132 may be ensured, such that it does not peel or break off during storage of optical waveguide 108 and during construction of an associated feedstock line.
Referring generally to, e.g.,
Again, applying second resin 134 such that it also covers first resin 132 may be an easier and less-expensive process than applying second resin 134 only to contact and cover regions 130.
Referring generally to, e.g.,
Method 600 provides an inexpensive process for creating optical waveguide 108. For example, an off-the-shelf non-cladded optical fiber may be used as optical core 146, and peripheral surface 152 thereof may be roughened.
Any suitable process for increasing surface roughness of peripheral surface may be used including, for example, mechanical processes, chemical processes, thermal processes (e.g., utilizing a laser), etc.
Referring generally to, e.g.,
By applying cladding 120 to cover peripheral surface 152, the integrity of the surface roughness of peripheral surface 152 may be maintained, and by selecting a cladding refractive index that is lower than the optical-core refractive index ensures that electromagnetic radiation 118 can operatively exit optical core 146 at desired locations as a result of the surface roughness of peripheral surface 152.
Examples of the present disclosure may be described in the context of aircraft manufacturing and service method 1100 as shown in
Each of the processes of illustrative method 1100 may be performed or carried out by a system integrator, a third party, and/or an operator (e.g., a customer). For the purposes of this description, a system integrator may include, without limitation, any number of aircraft manufacturers and major-system subcontractors; a third party may include, without limitation, any number of vendors, subcontractors, and suppliers; and an operator may be an airline, leasing company, military entity, service organization, and so on.
As shown in
Apparatus(es) and method(s) shown or described herein may be employed during any one or more of the stages of the manufacturing and service method 1100. For example, components or subassemblies corresponding to component and subassembly manufacturing (block 1108) may be fabricated or manufactured in a manner similar to components or subassemblies produced while aircraft 1102 is in service (block 1114). Also, one or more examples of the apparatus(es), method(s), or combination thereof may be utilized during production stages 1108 and 1110, for example, by substantially expediting assembly of or reducing the cost of aircraft 1102. Similarly, one or more examples of the apparatus or method realizations, or a combination thereof, may be utilized, for example and without limitation, while aircraft 1102 is in service (block 1114) and/or during maintenance and service (block 1116).
Different examples of the apparatus(es) and method(s) disclosed herein include a variety of components, features, and functionalities. It should be understood that the various examples of the apparatus(es) and method(s) disclosed herein may include any of the components, features, and functionalities of any of the other examples of the apparatus(es) and method(s) disclosed herein in any combination, and all of such possibilities are intended to be within the scope of the present disclosure.
Many modifications of examples set forth herein will come to mind to one skilled in the art to which the present disclosure pertains having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the present disclosure is not to be limited to the specific examples illustrated and that modifications and other examples are intended to be included within the scope of the appended claims. Moreover, although the foregoing description and the associated drawings describe examples of the present disclosure in the context of certain illustrative combinations of elements and/or functions, it should be appreciated that different combinations of elements and/or functions may be provided by alternative implementations without departing from the scope of the appended claims. Accordingly, parenthetical reference numerals in the appended claims are presented for illustrative purposes only and are not intended to limit the scope of the claimed subject matter to the specific examples provided in the present disclosure.
Claims
1. An optical waveguide (108), comprising:
- an optical core (146), comprising a first end face (148), a second end face (150), opposite the first end face (148), and a peripheral surface (152), extending between the first end face (148) and the second end face (150); and
- wherein the optical waveguide (108) is configured such that when electromagnetic radiation (118) enters the optical core (146) via at least one of the first end face (148), the second end face (150), or the peripheral surface (152), at least a portion of the electromagnetic radiation (118) exits the optical core (146) via the peripheral surface (152).
2. The optical waveguide (108) according to claim 1, wherein the optical waveguide (108) is further configured such that when the electromagnetic radiation (118) enters the first end face (148) of the optical core (146), an initial portion of the electromagnetic radiation (118) exits the optical core (146) via the peripheral surface (152), and a final portion of the electromagnetic radiation (118), remaining in the optical core (146) after the initial portion of the electromagnetic radiation (118) exits the optical core (146), exits the optical core (146) via the second end face (150).
3. The optical waveguide (108) according to claim 2, wherein the optical waveguide (108) is further configured such that the initial portion of the electromagnetic radiation (118), which exits the optical core (146) via the peripheral surface (152), is greater than or equal to the final portion of the electromagnetic radiation (118), which exits the optical core (146) via the second end face (150).
4. The optical waveguide (108) according to claim 3, wherein:
- the optical core (146) has an optical-core refractive index;
- the optical waveguide (108) further comprises a cladding (120), at least partially covering the optical core (146);
- the cladding (120) comprises at least a first resin (132), having a first-resin refractive index;
- the cladding (120) is non-uniform along the optical waveguide (108); and
- the optical-core refractive index is greater than the first-resin refractive index.
5. The optical waveguide (108) according to claim 4, wherein:
- the peripheral surface (152) has regions (130), devoid of the first resin (132);
- the cladding (120) further comprises a second resin (134), having a second-resin refractive index;
- the second resin (134) contacts the regions (130) of the peripheral surface (152); and
- the second-resin refractive index is greater than the first-resin refractive index.
6. The optical waveguide (108) according to claim 5, wherein the second resin (134) covers the first resin (132).
7. The optical waveguide (108) according to claim 1, wherein:
- the optical core (146) has an optical-core refractive index;
- the optical waveguide (108) further comprises a cladding (120), at least partially covering the optical core (146);
- the cladding (120) comprises at least a first resin (132), having a first-resin refractive index;
- the cladding (120) is non-uniform along the optical waveguide (108); and
- the optical-core refractive index is greater than the first-resin refractive index.
8. The optical waveguide (108) according to claim 7, wherein:
- the peripheral surface (152) has regions (130), devoid of the first resin (132);
- the cladding (120) further comprises a second resin (134), having a second-resin refractive index;
- the second resin (134) contacts the regions (130) of the peripheral surface (152); and
- the second-resin refractive index is greater than the first-resin refractive index.
9. The optical waveguide (108) according to claim 8, wherein the second resin (134) covers the first resin (132).
10. The optical waveguide (108) according to claim 1, wherein the peripheral surface (152) has a surface roughness that is selected such that when the electromagnetic radiation (118) enters the optical core (146) via at least one of the first end face (148), the second end face (150), or the peripheral surface (152), at least a portion of the electromagnetic radiation (118) exits the optical core (146) via the peripheral surface (152).
11. The optical waveguide (108) according to claim 10, wherein the optical waveguide (108) is devoid of any cladding that covers the optical core (146).
12. The optical waveguide (108) according to claim 10, wherein the surface roughness of the peripheral surface (152) creates regions of internal reflection of the electromagnetic radiation (118) within the optical core (146) and creates other regions where the electromagnetic radiation (118) is permitted to escape the optical core (146).
13. A method (400) of modifying an optical fiber (126) to create an optical waveguide (108), the optical fiber (126) comprising an optical core (146), having an optical-core refractive index, and a cladding (120), comprising at least a first resin (132), having a first-resin refractive index that is lower than the optical-core refractive index, the cladding (120) covering a peripheral surface (152) of the optical core (146) and extending between a first end face (148) and a second end face (150) of the optical core (146), the method (400) comprising a step of:
- removing portions (128) of the cladding (120) to expose regions (130) of the peripheral surface (152) such that at least a portion of electromagnetic radiation (118), entering the optical core (146) via at least one of the first end face (148), the second end face (150), or the peripheral surface (152), exits the optical core (146) via the regions (130) of the peripheral surface (152).
14. The method (400) according to claim 13, further comprising a step of:
- applying a second resin (134) to contact the regions (130) of the peripheral surface (152); and
- wherein the second resin (134) has a second-resin refractive index that is greater than the first-resin refractive index.
15. The method (400) according to claim 14, wherein the step of applying the second resin (134) to contact the regions (130) of the peripheral surface (152) comprises covering the first resin (132) with the second resin (134).
16. A method (500) of modifying an optical core (146) to create an optical waveguide (108), the optical core (146) comprising a first end face (148), a second end face (150), opposite the first end face (148), and a peripheral surface (152), extending between the first end face (148) and the second end face (150), the method (500) comprising a step of:
- applying a first resin (132) to the peripheral surface (152) of the optical core (146) so that regions (130) of the peripheral surface (152) remain uncovered by the first resin (132); and
- wherein: the first resin (132) has a first-resin refractive index; the optical core (146) has an optical-core refractive index that is greater than the first-resin refractive index; and at least a portion of electromagnetic radiation (118), entering the optical core (146) via at least one of the first end face (148), the second end face (150), or the peripheral surface (152), exits the optical core (146) via the peripheral surface (152).
17. The method (500) according to claim 16, further comprising a step of:
- applying a second resin (134) to contact the regions (130) of the peripheral surface (152) to create with the first resin (132) a cladding (120) that covers the peripheral surface (152) of the optical core (146); and
- wherein the second resin (134) has a second-resin refractive index that is greater than the first-resin refractive index.
18. The method (500) according to claim 17, wherein the step of applying the second resin (134) to contact the regions (130) of the peripheral surface (152) comprises covering the first resin (132) with the second resin (134).
19. A method (600) of modifying an optical core (146) to create an optical waveguide (108), the optical core (146) comprising a first end face (148), a second end face (150), opposite the first end face (148), and a peripheral surface (152), extending between the first end face (148) and the second end face (150), the method (600) comprising a step of:
- increasing surface roughness of all or portions of the peripheral surface (152) of the optical core (146) so that at least a portion of electromagnetic radiation (118), entering the optical core (146) via at least one of the first end face (148), the second end face (150), or the peripheral surface (152), exits the optical core (146) via the peripheral surface (152).
20. The method (600) according to claim 19, further comprising a step of:
- applying a cladding (120) to cover the peripheral surface (152); and
- wherein: the optical core (146) has an optical-core refractive index; the cladding (120) has a cladding refractive index; and the optical-core refractive index is lower than the cladding refractive index.
Type: Application
Filed: Feb 20, 2020
Publication Date: Jun 18, 2020
Inventors: Mark Stewart Wilenski (Mercer Island, WA), Michael Patrick Kozar (Mercer Island, WA), Samuel F. Harrison (Lynnwood, WA), Nick Shadbeh Evans (Lynnwood, WA), Faraón Torres (Everett, WA)
Application Number: 16/796,723