Abstract: Surface pressure measurements on rotating models are important for flow phenomenon identification, understanding flow mechanisms and model aerodynamic design. The disclosure discloses a periodic pressure field measurement system based on the superposed lifetime of pressure sensitive paint, including pressure sensitive paint, a pulse light source, a camera, a synchronizer and a computer. A lifetime superposition method is disclosed in the disclosure for measuring periodic pressure fields of pressure sensitive paint.

Abstract: An assessment device (1) according to the present disclosure includes a determination unit (10) that determines a first period corresponding to a shortest period until deterioration of a concrete structure due to an aging-induced deterioration cause appears and a second period shorter than the first period and corresponding to a longest period until deterioration of the concrete structure due to a material-induced deterioration cause appears and an assessment unit (20) that assesses that a deterioration causing material is used in a concrete structure having, in a checking result indicating a period elapsed from construction of the concrete structure and the presence or absence of deterioration in the concrete structure, the deterioration and the period elapsed from the construction which is not shorter than the second period and is shorter than the first period.

Abstract: A thermal barrier coating is provided. The thermal barrier coating is configured to remain adherent to a substrate under high strains, thus allowing the use of non-contacting strain measurement systems, using digital image correlation for example. The thermal barrier coating may include a first layer of a partially metallic material configured to adhere to a metallic substrate, and a second layer of a partially ceramic material configured to adhere to the first layer. A successful configuration has a top layer thickness that is approximately two-thirds of the first layer thickness.

Abstract: A stress luminescence measurement method according to one aspect includes the steps of: placing a stress luminescent material on a surface of a sample; irradiating the stress luminescent material with excitation light; acquiring a first captured image by imaging the stress luminescent material during irradiation of the excitation light; applying a load to the sample; acquiring a stress luminescence image by imaging stress luminescence of the stress luminescent material; irradiating the stress luminescent material after removal of the load with the excitation light; acquiring a second captured image during irradiation of the excitation light by imaging the stress luminescent material in a state in which the load has been removed; and storing the first captured image and the second captured image in a memory in association with the stress luminescent image.

Abstract: Disclosed are methods that, by not physically touching a material being measured, can measure the material's differential response quite accurately. A collimated light shines on the material under test, is reflected off it, and is then captured by a device that records the position where the reflected light is captured. This process is done both before and after the material is processed in some way (e.g., by applying a coat of paint). The change in position where the reflected light is captured is used in calculating the deflection of the material as induced by the process. This measured induced deflection is then used to accurately determinate the stress introduced into the material by the process. Other characteristics of the material under test, such as aspects of the material composition of a bi-metallic strip, for example, may also be determined from a deflection measurement.

Abstract: There is provided a removable chromatic witness assembly, system, and method to monitor thermal events and impact events on a surface of a composite structure. The removable chromatic witness assembly has a plurality of chromatic witness geometric configurations separately coupled in an arrangement to one or more portions of a polymeric film layer. Each chromatic witness geometric configuration has a plurality of chromatic probes of a same type incorporated into an adhesive material. At least two of the geometric configurations have a different type of chromatic probes with a different sensing capability for thermal events and impact events on the composite structure. The polymeric film layer and the geometric configurations form the removable chromatic witness assembly in a form of a removable chromatic witness applique configured to be removably applied directly and continuously to the surface of the composite structure, and configured to monitor the thermal and impact events.

Abstract: A method of using a paint sensor to observe stress distributions of a stressed substrate includes the steps of applying a composition including a paintable medium and a mechanoluminescence material to a substrate, allowing the composition to form a solid film on the substrate, allowing the substrate to be stressed following the formation of the solid film, and measuring the stress the substrate has undergone by determining the mechanoluminescence of the solid film. A composition for visualizing stress or crack distributions includes a paintable medium and a mechanoluminescence material dispersed therein.

Abstract: Methods for measuring the effective fracture toughness in a material are described. A rail and roller system are used to apply a gradual force to a specimen. The time-dependent force creates a steady fracture development that allows a camera to record the progressive fracture in the material. Mathematical methods can then be used to analyze the fracture progression and determine the effective fracture toughness.

Abstract: The present invention relates to the field of display technology, and particularly provides a flexible substrate, an OLED device including the flexible substrate and a defect detecting method for the same. The flexible substrate comprises a bottom plate and a barrier layer arranged above the bottom plate, wherein the flexible substrate further comprises a crack detection layer, which is arranged adjacent to the barrier layer; the crack detection layer produces a crack when the barrier layer produces a crack; and the color of the crack detection layer with a crack is different from that of the crack detection layer without a crack in a power-on state. The flexible substrate and the OLED device have relatively high detection efficiency, and can ensure the accuracy of detection, so that the rate of qualified products of the flexible substrate and the OLED device are improved.

Abstract: An apparatus for supporting tissue during compression prior to the insertion of a surgical element into the tissue has a substrate. The substrate is made from a predetermined material. The predetermined material has a thickness and a predetermined stress strain profile. The predetermined stress strain profile is complementary to a stress strain profile of the tissue and permits the substrate to support the tissue when the surgical element is delivered into the tissue. The substrate provides hemostasis control of the tissue when the surgical element is delivered into the tissue.

Abstract: A composite bonded structure with integral stress sensing and bond evaluation system incorporates a bonded structure having a first component, a second component and a layer of adhesive bonding the first and second components. The layer of adhesive includes multiple embedded fluorescing particles which emit a first spectral intensity in an unstressed condition and a second spectral intensity in a stressed condition. A bond evaluation apparatus is then employed for measuring spectral intensity.

Abstract: An apparatus and method detect damage of a component of a system. The damage detection apparatus includes a first grid of sensors arranged in a first orientation on a surface of the component and configured to generate a first set of signals. The apparatus also includes a second grid of sensors, independent from the first grid of sensors, arranged in a second orientation on an insulating layer on the surface of the component and configured to generate a second set of signals, the second orientation overlapping with the first orientation. A processor detects the damage based on a change in at least one signal of the first set of signals or the second set of signals.

Abstract: A pressure sensor includes a flexible membrane deformable in response to pressure. The flexible membrane covers a cavity and includes a strain gauge that produces signals corresponding to deformation of the flexible membrane. The flexible membrane is a flexible monolithic integrated circuit foil.

Abstract: A mechanochromic coating composition is disclosed comprising a polymeric network incorporating a plurality of ring-opening mechanophores each bound at two positions thereof within said polymeric network.

Abstract: A fluid transfer device and methods and apparatuses for making same is provided. The fluid transfer device comprises a conduit configured to transfer a fluid. The fluid transfer device further comprises a sheath surrounding the perimeter of the conduit and extending along at least part of the length of the conduit. In some embodiments, the interior of the sheath may be grooved to facilitate movement of the fluid from the location or locations of a leak or leaks along the length of the fluid transfer device. The sheath comprises one or more leak detection portions configured to provide an indication of fluid leaking from the conduit.

Abstract: A coating system includes at least one polymeric coating layer comprising at least one fluorescent dye, wherein an optical behavior of the fluorescent dye changes as a function of a stress of the at least one polymeric coating.

Abstract: A detection device for shocks on a part comprises a base intended to be fixed by a lower face onto a surface of the part where the occurrence of a shock is to be detected and comprises one or more detectors fixed at the base and protruding with respect to the base, a detector being deformed in a persistent way with a magnitude equal to or greater than a threshold magnitude when it is subjected to a shock with an energy equal to or greater than a threshold energy. Under the effect of such a shock with energy or greater, a detector is simply deformed or broken such that the visual inspection allows the occurrence of the shock to be detected.

Abstract: The present invention is directed to a device for measuring a deformation ratio of a structure which includes a photonic crystal layer containing nanoparticles aligned at a certain interval. The device is useful for detecting when various industrial structures are deformed by a working load. The presence of deformation and the deformation ratio in the structures may be simply and easily measured by measuring the change of structural color or magnetic flux in the device. The device may be useful to prevent accidents due to excessive deformation in structures.

Abstract: A medical device comprising a wall, a coating of SiOx, and a piezochromic material is disclosed. The piezochromic material is associated with the wall, and changes its appearance when the wall is exposed to mechanical stress exceeding a threshold intensity. Also disclosed is a method of interrogating a closed medical device for processing damage, comprising at least the acts of providing a closed medical device and inspecting the medical device. The medical device is inspected from the exterior for a change in the appearance of at least some of its piezochromic material that is characteristic of exposure of the wall to mechanical stress exceeding a threshold intensity greater than zero. Optionally in any embodiment inspecting is carried out using a spectrophotometer to determine the change in the color of at least some of its piezochromic material.

Abstract: A mechanochromic coating composition is disclosed comprising a polymeric network incorporating a plurality of ring-opening mechanophores each bound at two positions thereof within said polymeric network.

Abstract: Disclosed herein is an apparatus and a method to use such an apparatus for visualizing the contraction stress from curable materials. Particularly, a simple test device has been designed and fabricated and a method of using such a device, which allows a user to easily distinguish the curable materials that can generate contraction stress in different magnitudes. More specifically, the present disclosure provides a simple and effective way to make the complicated contraction stress due to polymerization (curing or setting) visualizable and audible.

Abstract: A mechanochromic material includes a polymer having a backbone containing a mechanophore.

Abstract: The present invention relates to a device for measuring a deformation ratio of a structure and a method of measuring a deformation ratio of a structure using the same. More specifically, the device for measuring a deformation ratio of a structure according to the present invention comprises a photonic crystal layer containing nanoparticles aligned at a certain interval. According to the present invention, when various industrial structures are deformed by a working load, and the like, presence of deformation and the correct deformation ratio in the structures may be simply and easily measured by measuring the change of structural color or magnetic flux in the corresponding part, and this measurement of deformation may also prevent accidents due to excessive deformation in structures.

Abstract: A method of detecting excessive strain in an elongated flexible member comprising: (a) applying at least one strain-detecting strip to the flexible member in an area that will be subject to bending in installation or use; (b) installing the flexible member in place; and (c) after installation, inspecting the strain-detecting strip for signs of excessive strain in the flexible member.

Abstract: A sensing system for use in monitoring the structural health of a structure such as a polymeric matrix composite structure is provided. The system includes a sensor formed from a conductive ink containing carbon nanofibers and a polymeric resin, and a data acquisition system for acquiring and evaluating data from the sensor. The conductive ink may be applied directly to the structure to be monitored in the form of a grid pattern. Damage to the structure may be detected by measuring changes in resistance values detected from the sensor.

Abstract: A method and means for determining a critical elongation strain rate of a polymer melt, which make it possible to subject a polymer melt to elongation to prepare a bulk oriented melt, are established, and a process for producing bulk polymer oriented crystals and polymer oriented crystals are provided. In the critical elongation strain rate determination process or critical elongation strain rate determining method, a polymer melt (3) in a disc shape having a radius x0 and a thickness of ?z0 is held between transparent plates (an upper transparent plate (1) and a lower transparent plate (2)). The polymer melt (3) is cooled to a supercooled state and is press in a thickness direction at a constant rate v by using the transparent plates. The critical point radius x*, at which the polymer melt (3) is turned to an oriented crystal, is measured, and the critical elongation strain rate ? is calculated by equation ?*=ax*3 wherein ?=v/(2?z0x03).

Abstract: A mechanochromic material includes a polymer having a backbone containing a mechanophore.

Abstract: A strain-responsive visual indicator comprises a pair of overlapping shutter strips (1, 2) adapted to be mounted to a substrate such that strain in the substrate causes relative movement M between them. Each shutter strip comprises an alternating set of windows (5) or (6) and bars (7) or (8) and the distal strip (2) is backed by a strip (3) of a different color exposed through its windows (6), or the distal strip can instead be printed with a set of alternating colors in place of its windows and bars. The effect is that under different strain conditions different color indications from the distal strip (2) will be visible through the windows (5) of the proximal strip (1), in accordance with the relative positions of the two strips. The indicator can be incorporated e.g. in the shaft of a toothbrush to give a visual warning in response to flexure of the shaft if excessive brushing pressure is applied. Numerous other applications and the use of different types of indicia are indicated in the specification.

Abstract: Systems and methods for indicating applied manipulation pressure are disclosed. In one embodiment, a method for indicating applied manipulation pressure includes affixing a pressure sensitive material to a coupling component. The pressure sensitive material is capable of displaying visual indications that correspond to different levels of applied manipulation force. A manipulation force is applied to the component. Subsequently, the pressure sensitive material displays the visual indications. In a specific implementation, the method also includes stopping the application of manipulation force when one of the visual indications is displayed.

Abstract: A method of detecting excessive strain in an elongated flexible member comprising: (a) applying at least one strain-detecting strip to the flexible member in an area that will be subject to bending in installation or use; (b) installing the flexible member in place; and (c) after installation, inspecting the strain-detecting strip for signs of excessive strain in the flexible member.

Abstract: The invention relates to a technique for reducing computation time for force vector calculation. A force vector reconstruction method that uses an optical tactile sensor, comprises a step for obtaining a marker image by taking an image of behavior of colored markers when an object contacts a contact surface of an elastic body, a step of obtaining information relating to the marker behavior from the marker image, the information being more than the number of force vectors to be obtained, and a step of obtaining force vectors as outputs by inputting information relating to the obtained marker behavior to a transfer function. The step of obtaining force vectors comprises calculating force vectors using only information relating to behavior of markers neighboring region A1 of a position A where it is desired to obtain force vectors.

Abstract: For forming an annular magnetostrictive coat on an outer peripheral surface of a rotational shaft associated with a magnetostrictive torque sensor, a magnetostrictive-coat forming method comprises a step of fitting a cylindrical masking jig over the outer peripheral surface of the rotational shaft and securing the masking jig to the outer peripheral surface, a step of placing the rotational shaft in a plating tank to thereby form the magnetostrictive coat by plating on the outer peripheral surface, and a step of detaching the masking jig from the rotational shaft.

Abstract: A sensor has a plurality of carbon nanotube (CNT)-based conductors operatively positioned on a substrate. The conductors are arranged side-by-side, such as in a substantially parallel relationship to one another. At least one pair of spaced-apart electrodes is coupled to opposing ends of the conductors. A portion of each of the conductors spanning between each pair of electrodes comprises a plurality of carbon nanotubes arranged end-to-end and substantially aligned along an axis. Because a direct correlation exists between the resistance of a carbon nanotube and its strain, changes experienced by the portion of the structure to which the sensor is coupled induce a corresponding change in the electrical properties of the conductors, thereby enabling detection of crack growth in the structure.

Abstract: One embodiment of the invention is a method for evaluating a material such as low-k dielectric, by a stress-generating test tool such as a needle. The evaluation object is shaped as a stack of adhering layers: low-k dielectric, first metal (preferably copper), barrier metal (preferably tantalum nitride), and second metal (preferably aluminum). A numerical correlation is established between a cracking in the barrier metal layer caused by probing and a damage in the layer of insulating material-to-be-tested. A predetermined number of locations of the top metal layer is selected for the probing step comprising touch-down, applying force, and lifting is repeated so that the number of repeats provide a pre-determined statistical confidence level.

Abstract: A film is placed between contacting surfaces in an assembly. The film has an optical property responsive to pressure. A compressive force is applied to the contacting surfaces to generate an initial pressure pattern. The film is removed from between the contacting surfaces. The optical property is sensed to derive a sensed initial pressure pattern. A stored setting controls the compressive force. The sensed initial pressure pattern is compared to a reference pressure pattern. The stored setting is updated to adjust the compressive force as a function of the comparing.

Abstract: A method of measuring a load on a surface produced by a contact force. An elastic film or coating is located on a supporting surface to provide an indication of normal and tangential or shear forces applied to the surface. A thickness measurement, corresponding to a normal displacement, and a tangential displacement of the film, corresponding to a shear displacement, is obtained and input to a response function to reconstruct the normal and shear load components of the contact force on the surface. A differential thickness measurement of the film is detected by an optical method in which a luminescent output from a luminophore in the film is measured. A luminescent output from a reference luminophore located below the film is also measured to provide a measurement system independent of the illumination source used to produce the luminescent output.

Abstract: A pressure indicating structure comprising (1) a translucent or transparent sheet including reflective structure defining at least a portion of a second surface of that sheet for reflecting back through a first opposite surface of the sheet light entering the sheet through its first surface, that reflective structure comprising a multiplicity of peak portions and recessed portions having recessed surface portions of the second surface that define recesses from the peak portions; and (2) a deformable layer comprising pressure sensitive adhesive having a major surface along the second surface of the sheet over the peak portions of the reflective structure.

Abstract: Devices and their subassemblies typically undergo stresses during manufacturing and testing processes and during general use. To provide visual indication of stress or strain levels endured, a preferred embodiment includes frangible material deposited on particular isolated areas of devices and/or their subassemblies. The frangible material, when applied according to one methodical embodiment, provides visible indication of overstrain as cracks in the frangible material deposits, and of non overstrain when cracks are not visible.

Abstract: A new family of multifunctional smart coatings based on diamond-like atomic-scale composite materials which can provide a real-time control of the surface stress distribution and potentially dangerous stress diagnostic for the most critical parts of flying vehicles. The coating is a silica-stabilized dielectric film, particularly, a diamond-like atomic-scale composite material.

Abstract: A measuring device (1; 21; 33) for controlling an installation torque of a fastening element (4; 32) and securable to engagement means (3; 35) of the fastening element (4; 32), includes an indicator (5; 24) for a visual display of the installation torque, a plurality of microcapsules filled with a dispersible color die and supported on the indicator (5; 24), and a transparent, at least regionwise, covering (7.1; 7.2; 22) provided on an outer surface of the indicator (5; 24); and an opening (27) through which a fastening element (4; 32) can extend.

Abstract: The invention relates to equipment such as for detecting and providing visual confirmation of pressure thereon, e.g. from an impact, which comprises an article having a sandwich construction with a pressure-disclosing layer (3) comprising a liquid crystal, thermochromic material, and a temperature differential layer (5), separated by a layer (4) providing a compressible mechanical shield between the pressure-disclosing layer and the temperature-differential layer. Material according to the invention can be employed to indicate the boundaries of a tennis court, or sports playing areas, or as a golf training aid, among other uses.

Abstract: For forming an annular magnetostrictive coat on an outer peripheral surface of a rotational shaft associated with a magnetostrictive torque sensor, a magnetostrictive-coat forming method comprises a step of fitting a cylindrical masking jig over the outer peripheral surface of the rotational shaft and securing the masking jig to the outer peripheral surface, a step of placing the rotational shaft in a plating tank to thereby form the magnetostrictive coat by plating on the outer peripheral surface, and a step of detaching the masking jig from the rotational shaft.

Abstract: Coating adhesive strength and shear strength measuring apparatus for measuring adhesive strength and shear strength of a coating of a test piece including a vertical pressure sensor linked at one end to a guide shaft which is movable in vertical and parallel directions relative to the coating surface of the test piece while a parallel pressure sensor is linked at its first end by a link to the other end of the vertical pressure sensor. The second end of the parallel pressure sensor is linked to a cutting knife. As the coating of the test piece is sliced with the cutting knife, the vertical pressure and the parallel pressure exerted on the cutting knife can be measured.

Abstract: A method of analyzing force on a surface is described including providing a pressure-sensitive medium, applying the force to the medium, determining any change in the medium as a result of the applied force, correlating the change in the medium with a pressure value, and analyzing the force value. The pressure-sensitive film may be scanned, each shade or color on the film assigned a pixel value corresponding with pressure values, and the total pixel area values measured to determine pressure characteristics, such as average pressure or total pressure area.

Abstract: A color pressure-sensitive fastener capable of providing a visual indication of a pressure threshold applied to the fastener is disclosed. The fastener includes a fastening portion which is actuated to fasten by way of application of a sufficient actuating pressure on an actuating surface of the fastening portion; and a pressure-sensitive substance associated with the actuating surface such that the actuating surface visibly changes color after the sufficient actuating pressure is applied to the actuating surface. This invention at least partially overcomes some of the disadvantages of typical fasteners, such as the lack of visual indication of proper installation of the fastener.

Abstract: This invention relates to methods for testing elongation and cracking of coating arrays. The method includes simultaneously applying an elongating force to each of a plurality of coatings, and monitoring the cracks and thickness decrease in each coating. A relative performance characteristic of each coating is then determined based on a correlation between a detected crack and/or thickness decrease in the coating, and the corresponding elongating force.

Abstract: A device built-in in a housing and capable to determine a pressure force in a quantitative way has been provided, the device including a storage phosphor panel or plate having storage phosphors essentially having tribostimulable properties, thereby providing energy conversion of the phosphors by means of pressure force or pressure energy to be determined. The method of measuring the pressure energy has also been described.

Abstract: A method of detecting surface pressure distribution of a wafer being processed by a CMP (Chemical Mechanical Polishing) process; more specifically, the invention relates to a method of detecting pressure distribution of a wafer surface by employing pressure sensitive films located on various pressure components such as a wafer carrier, a polishing pad, and mechanical arm members of a CMP machine for detecting pressure-related data during different stages of a CMP process. Further, sensed pressure-related data are collected for feedback loop controls of digital image mapping, numeration, simulation, and forecasting, from which more mechanical components of high precision and better circuit layouts on the wafer can then be developed.

Abstract: The present invention provides an apparatus, system and method which enables a determination of pressure on a surface which is coated with a pressure sensitive paint which, when flashed with light, exhibits return light with a decay time constant as a function of surface pressure. The system controls a light source which is adapted to emit a train of light pulses directed at the coated surface and controls a camera adapted to collect light level data from the surface. Further, a synchronizer is used to provide timing and control of the light source and the camera in which the synchronizer enables the light source and subsequently enables the camera to collect light level data in first and second gate periods. The first gate period is set to a predetermined time period associated with a light pulse and the second gate period is set to a predetermined time period subsequent to the first gate period. A decay time constant is determined from the data collected in the first gate period and the second gate period.

Abstract: The present invention relates to benefit agent containing delivery particles, compositions comprising said particles, and processes for making and using the aforementioned particles and compositions. When employed in compositions, for example, compositions for cleaning, fabric care, or coating onto various substrates, textiles or surfaces, such particles increase the efficiency of benefit agent delivery, thereby allowing reduced amounts of benefit agents to be employed. In addition to allowing the amount of benefit agent to be reduced, such particles allow a broad range of benefit agents to be employed.