REACTIVE SHAPED CHARGE, REACTIVE LINER, AND METHOD FOR TARGET PENETRATION USING A REACTIVE SHAPED CHARGE
Embodiments of a reactive shaped charge, a reactive liner, and a method for penetrating a target are generally described herein. The reactive shaped charge comprises a reactive liner having a matrix of reactive metal particles in a hydrocarbon fuel, a high explosive, and an inner barrier separating the reactive liner from the high explosive. The hydrocarbon fuel fills the interstitial spacing between the reactive metal particles, and the matrix is tightly packed or compresses to exhibit a solid like property.
This Patent Application claims priority to U.S. Provisional Patent Application Ser. No. 61/060,632, filed Jun. 11, 2008 entitled “APPARATUS AND METHODS FOR REACTIVE SHAPED CHARGE”, the entire contents of which is incorporated herein by reference.
TECHNICAL FIELDSome embodiments pertain to reactive shaped charges and shaped-charge warheads. Some embodiments pertain to reactive materials. Some embodiments pertain to reactive liners suitable for use in lined shaped charges. Some embodiments pertain to warheads and precision lethal technology.
BACKGROUNDA lined shaped charge generates an enormous amount of pressure by detonation of an explosive to drive a liner to penetrate a target. In conventional shaped charges, the residual liner material perforates a target's protective barrier and enters a confined target space. Because many conventional shaped charges use inert liner material, the residual liner material deposits only a small amount of energy, in the form of heat and pressure, before exiting the target. Conventional penetrating warheads require allocation of substantial warhead mass to survive an impact with a target and to perforate a protective target barrier to enable detonation of energetic materials within the target space.
Thus, what are needed are reactive shaped charges that are capable of perforating protective target barriers followed by signification energy release inside the confined target space. What are also needed are reactive liners suitable for use in shaped charges, and warheads that maximize the allocation of payload mass to the energetic verses inert material components.
The following description and the drawings sufficiently illustrate specific embodiments to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. Examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of other embodiments. Embodiments set forth in the claims encompass all available equivalents of those claims.
In accordance with some embodiments, the hydrocarbon fuel fills the interstitial spacing between the reactive metal particles to provide the matrix that comprises reactive liner 102. The matrix may be tightly packed to exhibit a solid property and so as to retain its shape unsupported by any structural housing exhibiting a non-liquid quality (i.e., a solid or solid-like property).
In some embodiments, reactive liner 102 is free of oxidant. In these embodiments, because the reactive liner is free from and devoid of an oxidant, any reaction may be delayed until liner 102 is dispersed and exposed to oxygen in the confined space of the target.
In some alternate embodiments, reactive liner 102 may include an oxidant, such as ammonium perchlorate or a synthetic fluoro-polymer, although the scope of the embodiments is not limited in this respect. Examples of synthetic fluoro-polymers include poly-tetra-fluoro-ethylene or poly-tetra-fluoro-ethene (PTFE).
In some embodiments, the reactive metal particles of the matrix may comprise a single reactive metal selected from the group consisting of aluminum, magnesium, zirconium, titanium and boron. In these embodiments, almost any metal that reacts with air or oxygen may be used. In some embodiments, metalloids may be used. Metalloids may have properties of both metals and non-metals.
In some alternate embodiments, the reactive metal particles may comprise two or more reactive metals selected from the group consisting of aluminum, magnesium, zirconium, titanium and boron. The two or more metals may be selected for reactive burn rate and matrix effective density, although the scope of the embodiments is not limited in this respect. In these embodiments, metalloids may also be used.
In some embodiments, sealed region 105 provided between inner barrier 106 and outer barrier 108 may be hermetically sealed, although the scope of the embodiments is not limited in this respect.
In some embodiments, inner barrier 106 and outer barrier 108 may have a trumpet-like shape (as shown in
In some embodiments, reactive liner 102 may be configured to have a low effective shear strength in tension. In these embodiments, the effective shear strength of reactive liner 102 may be lower than some conventional liners that, for example, include metal particles suspended in a wax. In accordance with embodiments of the present invention, reactive liner 102 may act like a liquid (shear flow) under high pressure (e.g., when high explosive 104 ignites).
In some embodiments, reactive shaped charge 100 may include one or more liner fill ports 103 to allow sealed region 105 to be filled with the matrix of reactive metal particles and hydrocarbon fuel. Sealed region 105 may be filled through liner fill ports 103 by performing a process that includes pouring the matrix of reactive metal particles and hydrocarbon fuel into region 105 through liner fill ports 103. The process may also include waiting for the reactive metal particles to settle and for excess liquid comprising the hydrocarbon fuel to form on a top surface near liner fill ports 103. The process may also include removing the excess liquid and/or the pouring, waiting and removing until region 105 is completely filled and/or until the density of the matrix is maximized. In some embodiments, this “settling-out” process may include pressing or compressing the matrix to help maximize or customize the density. Once region 105 is completely filled and/or the density of the matrix is maximized, the matrix may exhibit a solid property.
In some embodiments, the matrix may be initially provided in a slurry form with a lower density and steps of the process may be repeated to increase the density of the matrix or until a minimum density (e.g., between 2 and 4 g/cc) is achieved. In these embodiments, the hydrocarbon fuel may be in a liquid state, although the scope of the embodiments is not limited in this respect. In other embodiments, the hydrocarbon fuel may be in a gas state. In other embodiments, the matrix may be provided in a higher density form in which the matrix is compressed to reduce the interstitial spacing between the metal particles and displace the lower density hydrocarbon fuel.
In some alternate embodiments, a pressing operation may be performed to pre-form solid liners from the matrix. These pre-formed solid lines may be installed in a shaped charge. Alternatively, a pressing operation may be performed “in-situ” to form the solid liner in the shaped charge, although the scope of the embodiments is not limited in this respect.
In the alternate embodiments that reactive liner 102 includes an oxidant, the oxidant may be mixed in with the metal particles and the hydrocarbon fuel before the settling out and/or pressing operations described above.
In some embodiments, inner barrier 106 may comprise metallic material, such as copper, aluminum, titanium, and tantalum. In some other embodiments, inner barrier 106 may comprise a non-metallic material, such as nylon. In some embodiments, outer barrier 108 may comprise copper, aluminum, titanium, and tantalum. In some embodiments, high explosive 104 may be a HMX based composition, such as PBXN-110, or may comprise RDX based compositions although other high explosives may also be suitable. In some embodiments, the hydrocarbon fuel used in reactive liner 102 may comprise a jet fuel such as JP-5, JP-8 or JP-10, although other fuels, such as kerosene, gasoline and diesel may also be suitable.
Although reactive liner 102 is illustrated in
Some embodiments of the present invention provide a reactive liner for use in a shaped charge or warhead. In these embodiments, the reactive liner comprises a matrix of reactive metal particles in a hydrocarbon fuel. The hydrocarbon fuel fills in the interstitial spacing between the reactive metal particles. The matrix may be tightly packed or compressed to exhibit a solid property. In some embodiments, the reactive liner may be free of oxidant. In alternate embodiments, the reactive line may include an oxidant.
In some embodiments, a method for penetrating a target with a reactive shaped charge is provided. In these embodiments, the reactive shaped charge may include a reactive liner, such as reactive liner 102, and a high explosive.
The method may include launching the reactive shaped charge toward a target and detonating the high explosive. The detonation of the high explosive may cause the reactive liner to form a high velocity jet to perforate protective target barriers and to disperse and mix with air in a target space followed by a rapid combustion of the mixture of the reactive metal particles, the hydrocarbon fuel and the air. In these embodiments, the reactive liner may comprise a matrix of reactive metal particles in a hydrocarbon fuel as discussed above and may be provided in a sealed region. The hydrocarbon fuel may fill the interstitial spacing between the reactive metal particles. The matrix of the reactive metal particles and the hydrocarbon fuel may be tightly packed to exhibit a solid property.
The Abstract is provided to comply with 37 C.F.R. Section 1.72(b) requiring an abstract that will allow the reader to ascertain the nature and gist of the technical disclosure. It is submitted with the understanding that it will not be used to limit or interpret the scope or meaning of the claims. The following claims are hereby incorporated into the detailed description, with each claim standing on its own as a separate embodiment.
Claims
1. A reactive shaped charge comprising:
- a reactive liner comprising a matrix of reactive metal particles in a liquid hydrocarbon fuel;
- a high explosive; and
- an inner barrier separating the reactive liner from the high explosive.
2. The shaped charge of claim 1 wherein the reactive liner is provided in a sealed region between an outer barrier and the inner barrier.
3. The shaped charge of claim 2 wherein the liquid hydrocarbon fuel fills an interstitial spacing between the reactive metal particles,
- wherein the matrix is tightly packed to exhibit a solid property, and
- wherein the reactive liner is free of oxidant.
4. The shaped charge of claim 2 wherein the liquid hydrocarbon fuel fills an interstitial spacing between the reactive metal particles,
- wherein the matrix is tightly packed to exhibit a solid property, and
- wherein the reactive liner includes an oxidant.
5. The shaped charge of claim 3 wherein the reactive metal particles comprise a single reactive metal selected from the group consisting of aluminum, magnesium, zirconium, titanium and boron.
6. The shaped charge of claim 3 wherein the reactive metal particles comprise two or more reactive metals selected from the group consisting of aluminum, magnesium, zirconium, titanium and boron, and
- wherein the two or more metals are selected for reactive burn rate and matrix effective density.
7. The shaped charge of claim 3 wherein the sealed region between the inner barrier and the outer barrier comprising the reactive liner is hermetically sealed.
8. The shaped charge of claim 3 wherein the inner barrier and the outer barrier have a trumpet-like shape to provide the reactive liner in a trumpet-like shape with an apex toward a detonator of the shaped charge.
9. The shaped charge of claim 8 wherein when the high explosive is detonated, the reactive liner forms a jet directed in a direction of a target, and
- wherein the matrix of reactive metal particles and the liquid hydrocarbon fuel is configured to disperse and mix with ambient air within a target space and then rapidly combust after perforation of a protective target barrier.
10. The shaped charge of claim 3 further comprising one or more liner fill ports to allow the sealed region to be filled with the matrix.
11. The shaped charge of claim 10 wherein the sealed region is configured to be filled through the liner fill ports by performing a process that includes:
- pouring the matrix of the reactive metal particles and the liquid hydrocarbon fuel into the region through the liner fill ports;
- waiting for the reactive metal particles to settle and for any excess liquid hydrocarbon fuel to form on a top surface near the liner fill ports;
- removing the excess liquid; and
- repeating the pouring, waiting and removing to completely fill the region and maximize a density of the matrix.
12. The shaped charge of claim 3 wherein the reactive liner is formed by a pressing operation to pre-form the matrix in a shape for installation in the shaped charge.
13. The shaped charge of claim 3 wherein the reactive liner is formed by a pressing operation to form the reactive liner from the matrix within the shaped charge.
14. The shaped charge of claim 3 wherein both the inner barrier and the outer barrier have conical shapes with differing apex angles to define the reactive liner having a conical shape with an apex toward a detonator of the shaped charge.
15. The shaped charge of claim 3 wherein the inner barrier has a conical shape and the outer barrier provides a flat base of the conical shape to define the reactive liner, the sealed region comprising a volume of a cone.
16. The shaped charge of claim 3 wherein the inner barrier has a trumpet-like shape and the outer barrier has a hemispherical shape to define the sealed region that comprises the reactive liner.
17. The shaped charge of claim 3 wherein both the inner barrier and the outer barrier have the hemispherical shape and define the sealed region that comprises the reactive liner, the hemispherical shape being convex toward a detonator.
18. The shaped charge of claim 3 wherein the inner barrier has the hemispherical shape and the outer barrier provides a flat base to define the sealed region, the hemispherical shape being convex toward a detonator.
19. The shaped charge of claim 3 wherein the reactive liner and the high explosive are arranged in a stacked configuration within a casing.
20. The shaped charge of claim 1 wherein a plurality of pre-formed metal shapes are provided for fragmentation effects on a target within an outer region of a casing outside a region containing the high explosive.
21. A reactive liner for use in a shaped charge, the reactive liner comprising a matrix of reactive metal particles in a hydrocarbon fuel,
- wherein the liquid hydrocarbon fuel fills in an interstitial spacing between the reactive metal particles, and
- wherein the matrix is tightly packed to exhibit a solid property.
22. The reactive liner of claim 21 wherein the reactive liner is free of oxidant.
23. The reactive liner of claim 21 wherein the reactive liner includes an oxidant.
24. The reactive liner of claim 22 wherein the reactive metal particles comprise a single reactive metal selected from the group consisting of aluminum, magnesium, zirconium, titanium and boron.
25. The reactive liner of claim 22 wherein the reactive metal particles comprise a two or more reactive metals selected from the group consisting of aluminum, magnesium, zirconium, titanium and boron, and
- wherein the two or more metals are selected for reactive burn rate and matrix effective density.
26. The reactive liner of claim 22 wherein a high explosive of the shaped charge is detonated, the reactive liner forms a jet directed toward a target, and
- wherein the matrix of reactive metal particles and the liquid hydrocarbon fuel disperses and mixes with ambient air within a target space followed by rapid combustion after perforation of a protective target barrier.
27. The reactive liner of claim 22 wherein the liquid hydrocarbon fuel is in a liquid state, and
- wherein the reactive liner is configured to have a low effective shear strength in tension.
28. The reactive liner of claim 22 wherein the reactive liner is formed by a pressing operation to pre-form the matrix in a shape for installation in the shaped charge.
29. The reactive liner of claim 22 wherein the reactive liner is formed by a pressing operation to form the reactive liner from the matrix within a shaped charge.
30. A method for penetrating a target comprising:
- providing a reactive shaped charge having a reactive liner comprising a matrix of reactive metal particles in a liquid hydrocarbon fuel, a high explosive, and an inner barrier separating the reactive liner from the high explosive;
- launching the reactive shaped charge toward a target; and
- detonating the high explosive to cause the reactive liner to form a high velocity jet to perforate protective target barriers and to disperse and mix with air in a target space followed by a rapid combustion of the reactive metal particles, the liquid hydrocarbon fuel and the air.
31. The method of claim 30 wherein the reactive liner is provided in a sealed region between an outer barrier and the inner barrier,
- wherein the liquid hydrocarbon fuel fills an interstitial spacing between the reactive metal particles,
- wherein the matrix is tightly packed to exhibit a solid property, and
- wherein the reactive liner is free of oxidant.
32. The method of claim 30 wherein the reactive liner is provided in a sealed region between an outer barrier and the inner barrier,
- wherein the liquid hydrocarbon fuel fills an interstitial spacing between the reactive metal particles,
- wherein the matrix is tightly packed to exhibit a solid property, and
- wherein the reactive liner includes an oxidant.
33. The method of claim 31 wherein the inner barrier and the outer barrier have a trumpet-like shape to provide the reactive liner having a trumpet-like shape with an apex toward a detonator of the shaped charge.
34. The method of claim 33 wherein the reactive metal particles comprise a single reactive metal selected from the group consisting of aluminum, magnesium, zirconium, titanium and boron.
Type: Application
Filed: Dec 17, 2008
Publication Date: Oct 6, 2011
Inventors: Jesse T. Waddell (Tucson, AZ), Thomas H. Bootes (Tucson, AZ), George D. Budy (Tucson, AZ), Richard K. Polly (Tucson, AZ), Jason M. Shire (Tucson, AZ), Wayne Lee (Vail, AZ)
Application Number: 12/336,796
International Classification: F42B 1/028 (20060101); F42B 1/032 (20060101); F42B 1/036 (20060101);