1. Field of the Invention
The present invention relates to armor.
2. Description of Related Art
In combat situations, such as in military, police, and/or armored transport operations, it is desirable to protect vehicles, such as tanks, personnel carriers, trucks, and the like, as well as the vehicle's contents from damage by enemy fire. Accordingly, such vehicles are known to have armor to reduce the likelihood that ballistic rounds or other such projectiles will penetrate the vehicle. If the rounds penetrate the vehicle, the occupants of the vehicle may be injured or the vehicle's ability to operate may be impaired. It may also be desirable for the armor to be able to survive multiple rounds striking the armor in close proximity to one another, so that the integrity of the vehicle is not compromised or is only minimally compromised. Moreover, it is generally desirable for armor to include a relatively hard outer layer that the round encounters first. The hard outer layer starts the projectile or round defeat sequence by increasing the projectile dwell time on the armor, thus slowing the projectile down, or by blunting or fracturing the projectile early in the penetration event.
While protecting the vehicle and its occupants is generally of primary importance, other factors may play a role in the design of armor for the vehicle. It is desirable for the vehicle to be as lightweight as possible. Generally, a vehicle's fuel consumption increases as the vehicle's weight increases. A heavier vehicle usually requires a heavier drive train than a lighter vehicle, which further increases weight. Increased weight may also reduce the mobility of the vehicle and, thus, reduce the utility of the vehicle in combat. As the weight of the vehicle's armor contributes to the overall weight of the vehicle, it is desirable for the vehicle's armor to be as lightweight as possible. Many known armor systems, while protecting the vehicle from ballistic damage, add significant weight to the vehicle and provide little or no additional structural strength to the vehicle.
It is also not desirable for the vehicle's armor to greatly increase the overall size of the vehicle (e.g., the vehicle's height, width, length, volume, and the like), so that existing transportation equipment (e.g., trucks, trailers, aircraft, and the like) are capable of transporting the vehicle. If the size of the vehicle is increased over previous vehicles, the existing transportation equipment may not be capable of transporting the vehicle, or the existing transportation equipment may be limited to carrying fewer vehicles per load. Additionally, it is desirable to maximize the internal volume of the vehicle to allow adequate space to house the crew and crew gear. Accordingly, armor having lower volumes generally result in vehicle designs having larger internal volumes. The overall size of the vehicle is also a factor in combat situations. Generally, smaller targets (i.e., smaller vehicles) are more difficult to hit with artillery, such as rockets, mortars, missiles, and the like. Thus, it is desirable for the vehicle's overall size to be smaller, rather than larger, to reduce the likelihood of an artillery hit.
It is also desirable that the vehicle's armor be durable. During combat and during travel between combat locations, the vehicle may encounter flying rocks, debris, shrapnel, and the like. If the armor is overly thin or brittle, it may not be capable of surviving impacts from such sources.
Cost is also a consideration in vehicle armor. Armor that uses exotic materials (e.g., laminated ceramics of boron carbide, silicon carbide, alumina, and the like), or armor that has many components in difficult-to-produce configurations, may be quite effective in combat but may be unaffordable.
There are many designs of materials that are useful as armors and that are well known in the art; however, considerable shortcomings remain.
There is a need for an improved armor.
Therefore, it is an object of the present invention to provide an improved armor and a method of making the armor.
These and other objects are achieved by providing an armor that includes a face sheet, a spall liner, and a core disposed between the face sheet and the spall liner. The core includes a polymeric matrix and a plurality of ceramic rods disposed in the polymeric matrix. The armor further includes a first shock dissipation layer disposed between the face sheet and the core.
In another aspect, the present invention provides an armor, including a face sheet, a spall liner, and a core disposed between the face sheet and the spall liner. The core includes a polymeric matrix and a plurality of ceramic rods disposed in the polymeric matrix, wherein the plurality of ceramic rods exhibits an average height. The armor further includes a first, viscoelastic, shock dissipation layer disposed between the face sheet and the core, the first shock dissipation layer exhibiting a thickness of no more than about one-half of the average height of the plurality of ceramic rods. Moreover, the armor includes a second, viscoelastic, shock dissipation layer disposed between the spall liner and the core, the second shock dissipation layer exhibiting a thickness of no more than about one-half of the average height of the plurality of ceramic rods.
In yet another aspect of the present invention, a method is provided including the steps of providing a plurality of ceramic rods in a desired configuration, a face sheet, a first shock dissipation layer, and a spall liner; embedding the plurality of ceramic rods in a polymeric matrix to form a core having a first surface and a second surface opposing the first surface of the core; and disposing the first shock dissipation layer between the face sheet and the first surface of the core. The method further includes the step of disposing the spall liner proximate the second surface of the core to form an armor.
The present invention provides significant advantages, including: (1) providing an armor capable of withstanding multiple strikes from ballistic projectiles in a small area; (2) providing an armor that has a lower areal weight than conventional armors; and (3) providing an armor that is less expensive to produce than conventional armors.
Additional objectives, features and advantages will be apparent in the written description which follows.
The novel features believed characteristic of the invention are set forth in the appended claims. However, the invention itself, as well as, a preferred mode of use, and further objectives and advantages thereof, will best be understood by reference to the following detailed description when read in conjunction with the accompanying drawings, in which the leftmost significant digit(s) in the reference numerals denote(s) the first figure in which the respective reference numerals appear, wherein:
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and are herein described in detail. It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Illustrative embodiments of the invention are described below. In the interest of clarity, not all features of an actual implementation are described in this specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.
It should be appreciated that the following terms and phrases are intended to have a particular meaning throughout the following detailed description. The term “ceramic” refers to an inorganic, non-metallic material whose formation is due to the action of heat. The term “rod” means a three-dimensional, solid cylinder. The term “cylinder” refers to a solid having a surface created by projecting a closed two-dimensional curve along an axis that is not on or parallel to the plane of the curve. In a circular cylinder, the curve is a circle. In a right, circular cylinder, the curve is a circle and the plane of the circle is substantially perpendicular to the axis along which the circle is projected. In a octagonal cylinder, the curve is a hexagon. In a right, octagonal cylinder, the curve is a hexagon and the plane of the hexagon is substantially perpendicular to is substantially perpendicular to the axis along which the hexagon is projected.
Moreover, a “viscoelastic material” is a material that exhibits both elastic and viscous properties that are demonstrable in response to mechanical shear. “Vehicles” are devices, apparatuses, or the like that travel through a medium, such as air or water. Examples of vehicles include, but are not limited to, missiles, rockets, torpedoes, airplanes, helicopters, automobiles, trucks, military tanks, and drones. “Spall” refers to fragments broken from either a barrier (e.g., fragments broken from an armor as the result of penetration or the impact of a projectile) or from a projectile that has impacted the barrier. The term “simple contour,” as it relates to surfaces or shapes, is a surface that is curved in one direction. The term “complex contour” as it relates to surfaces or shapes, is a surface or shape that is contoured in at least two directions. The term “gradient” means rising or falling by regular degrees of inclination. The term “hexagonal-close-packed” means an arrangement wherein a central element is surrounded by six adjacent elements, such that the arrangement occupies a minimum amount of space.
The present invention represents an armor for lessening the destructive effects of ballistic projectiles, such as bullets. Generally, the armor of the present invention comprises a core including plurality of ceramic rods disposed in a polymeric matrix. An elastomeric layer is disposed between the core and a face sheet. A spall liner is disposed on a side of the core opposite that of the elastomeric layer. In use, the armor is oriented such that ballistic projectiles will preferably encounter the face sheet first.
While armor 101 is illustrated as being substantially flat in shape, the present invention contemplates other shapes, such as shapes having simple or complex contours. Moreover, an armor of the present invention may be generally rectangular, as illustrated herein, or may define any other desired, suitable shape for the particular implementation of the armor. Furthermore, while armor 101 of
Preferably, face sheet 103 comprises a material that will, to some degree, impede the progress of a ballistic projectile. For example, in various embodiments, face sheet 103 comprises titanium; a titanium alloy; aluminum; an aluminum alloy; an organic-matrix composite material, such as, for example, graphite-, carbon-, or fiberglass-reinforced epoxy composite material; a metal-matrix composite material, such as carbon-, silicon carbide-, or boron-reinforced titanium or aluminum composite material; a laminated material, such as titanium/aluminum laminate; or the like. Preferably, face sheet 103 comprises titanium; a titanium alloy; aluminum; an aluminum alloy; an organic-matrix composite material, such as, for example, graphite-, carbon-, or fiberglass-reinforced epoxy composite material; a laminated material, such as titanium/aluminum laminate; or the like.
Preferably spall liner 105 comprises a material that will drastically reduce the velocity of spall (e.g., projectile fragments or fragments of armor 101) exiting armor 101. More preferably, spall liner 105 comprises a material that will substantially prevent the spall from exiting the armor 101. For example, in various embodiments, spall liner 105 comprises one of the materials disclosed above as comprising face sheet 103. Preferably, spall liner 105 comprises titanium; a titanium alloy; aluminum; an aluminum alloy; an organic-matrix composite material, such as, for example, graphite-, carbon-, or fiberglass-reinforced epoxy composite material; a laminated material, such as titanium/aluminum laminate; or the like. It should be noted, however, that the particular compositions of face sheet 103 and spall liner 105 are implementation specific. Accordingly, the present invention contemplates faces sheets (e.g., face sheet 103) and spall liners (e.g. spall liner 105) comprising any material suitable for a particular implementation.
Referring now to
Referring again to
Turning now to
While, in a preferred embodiment, ceramic rods 203 are right, circular cylindrical in shape, the scope of the present invention is not so limited. Rather, as depicted in
Alternatively, as illustrated in
It should be noted that the particular configurations of the armor of the present invention that are disclosed herein and illustrated in the drawings are merely exemplary. The particular configuration of the armor of the present invention is implementation specific and, therefore, may take on many different forms. For example, particular elements of the armor of the present invention, as well as the armor itself, may exhibit different size and/or geometrical relationships than those illustrated herein. In such embodiments, for example, right cylindrical, ceramic rods 201, 703, and/or 901 may be merely cylindrical in shape. Thus, for example in embodiments wherein the armor of the present invention exhibits a thickness gradient, ceramic rods 203 (best shown in
The armor of the present invention, however, comprises a core disposed between a shock dissipation layer and a spall liner. The shock dissipation layer is disposed between the core and a face sheet. The core comprises a plurality of ceramic rods disposed in a polymeric matrix. In one embodiment, a second shock dissipation layer is disposed between the core and the spall liner. The face sheet, shock dissipation layers, core, and spall liner may be held in assembly by any suitable means, such as, for example, mechanical fastening means, adhesives, or the like.
It should be noted that the armor (e.g., armor 101, 701, 801, 903, 1001, or the like) of the present invention may comprise a portion of or be attached to a vehicle, such as, for example, a tank, a personnel carrier, a truck, or the like. In one particular operation of the present invention, a ballistic projectile striking face sheet 103 is somewhat blunted and the shock associated with the ballistic projectile striking face sheet 103 is dissipated or attenuated to a degree by first shock dissipation layer 401. In many instances, the ballistic projectile passes through face sheet 103 and first shock dissipation layer 401, striking core 201, 707, 805, 907, or 1007. Upon striking one or more ceramic rods 203, 703, or 901, the one or more the ballistic projectile is further blunted or fragmented. The one or more ceramic rods 203, 703, or 901 are likely also fragmented or shattered; however, polymeric matrix 205, 705, 803, 905, or 1005 aids in decreasing the velocity of ballistic projectile fragments and ceramic rod fragments, which are retained in armor 101, 701, 801, 903, or 1001 by spall liner 105 and edge close-outs, such as edge close-outs 107a-107d or the like. In some situations, polymeric matrix 205, 705, 803, 905, or 1005 also aids in dissipating the impact of the ballistic projectile and/or fragments thereof. It should be noted that the armor of the present invention is capable of withstanding multiple ballistic projectile strikes in a local area.
The particular embodiments disclosed above are illustrative only, as the invention may be modified and practiced in different but equivalent manners apparent to those skilled in the art having the benefit of the teachings herein. Furthermore, no limitations are intended to the details of construction or design herein shown, other than as described in the claims below. It is therefore evident that the particular embodiments disclosed above may be altered or modified and all such variations are considered within the scope and spirit of the invention. Accordingly, the protection sought herein is as set forth in the claims below. It is apparent that an invention with significant advantages has been described and illustrated. Although the present invention is shown in a limited number of forms, it is not limited to just these forms, but is amenable to various changes and modifications without departing from the spirit thereof.
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Number | Date | Country | |
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20090126557 A1 | May 2009 | US |