Impact Resistant Structures for Protective Garments

Abstract

A multi-layer composite structure is conformable to the contours of the body parts for which protection is required. The composition structure contains a rigid shock-deflecting outer layer, two semi-rigid shock-damping and shock-dissipating middle layers, and a pliable shock-absorbing lower layer. In one embodiment, the structure is designed for impacts associated with contact sports, such as football, hockey and lacrosse. In another embodiment, the structure is designed for military/police applications, in which impacts can be blunt forces, from weapons such as clubs, or penetrative forces, from knives, bullets or shrapnel.

Claims

1. A protective garment comprising: multiple interconnected impact resistant structures, wherein each impact resistant structure comprises four interconnected layers, consisting of a rigid outer shock-deflecting layer, overlaying a semi-rigid, deformable, polymer-based, microlattice shock-damping layer, overlaying a semi-rigid, polyurethane, honeycomb lattice dissipative layer, overlaying a shock-absorbing lower fabric layer.

2. The protective garment according to claim 1, wherein the microlattice shock-damping layer comprises a three-dimensional network of multiple hollow polymer nanotubes, having tube diameters less than 1 mm, and wherein the polymer nanotubes are interconnected at multiple nanotube nodes which undergo resilient deformation under an applied stress, thereby effecting a damping of the applied stress.

3. The protective garment according to claim 2, wherein the honeycomb lattice dissipative layer comprises multiple thermoplastic polyurethane open polygonal cells, less than 0.5 inches in diameter, having cell walls that are fused together without interstitial voids, and wherein the transmission of the applied stress through the open polygonal cells dissipates the applied stress, and wherein the honeycomb lattice dissipative layer constrains the microlattice shock-damping layer, thereby increasing the resilient deformation of the nanotube nodes and increasing the damping of the applied stress.

4. The protective garment according to claim 3, wherein the shock-absorbing lower fabric layer comprises a base woven layer, consisting of multiple woven fibers with interstices, and multiple carbon nanotubes, less than 1 mm in diameter, which are interwoven between the woven fibers and the interstices.

5. The protective garment according to claim 4, wherein the woven fibers of the base woven layer are breathable natural or artificial fibers that wick moisture.

6. The protective garment according to claim 4, wherein the woven fibers of the base woven layer are ballistic and puncture resistant.

7. The protective garment according to claim 5, wherein the outer shock-deflecting layer comprises a rigid, light-weight, impact-resistant plastic, polymer, polymer blend, or ceramic material.

8. The protective garment according the claim 6, wherein the outer shock-deflecting layer comprises a rigid plastic or metal material which is ballistic and puncture resistant.

9. The protective garment according to claim 7, wherein the outer shock-deflecting layer comprises one or more panels or shells, each of which is sized and contoured to conform to a size and a shape of a covered body part over which the panel or shell is to be worn.

10. The protective garment according to claim 8, wherein the outer shock-deflecting layer comprises one or more panels or shells, each of which is sized and contoured to conform to a size and a shape of a covered body part over which the panel or shell is to be worn.

11. The protective garment according to claim 9, wherein each of the panels or shells are sized and contoured by 3D printing in conjunction with 3D optical scanning of the covered body part.

12. The protective garment according to claim 10, wherein each of the panels or shells are sized and contoured by 3D printing in conjunction with 3D optical scanning of the covered body part.

13. The protective garment according to claim 9, wherein the covered body part is a body joint, and wherein the outer shock-deflecting layer comprises multiple overlapping, articulated concave panels, which are elastically interconnected so as to move translationally and rotationally with respect to one another.

14. The protective garment according to claim 10, wherein the covered body part is a body joint, and wherein the outer shock-deflecting layer comprises multiple overlapping, articulated concave panels, which are elastically interconnected so as to move translationally and rotationally with respect to one another.

15. The protective garment according to claim 11, wherein the covered body part is a body joint, and wherein the outer shock-deflecting layer comprises multiple overlapping, articulated concave panels, which are elastically interconnected so as to move translationally and rotationally with respect to one another.

16. The protective garment according to claim 12, wherein the covered body part is a body joint, and wherein the outer shock-deflecting layer comprises multiple overlapping, articulated concave panels, which are elastically interconnected so as to move translationally and rotationally with respect to one another.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1 is a cut-away view of an exemplary impact resistant breastplate structure in accordance with one embodiment of the present invention;

[0017] FIG. 2A is perspective view of an exemplary microlattice layer comprising a component of one embodiment of the present invention;

[0018] FIG. 2B is a magnified detail view of the exemplary microlattice of FIG. 2A under initial compression, showing incipient buckling deformation at microlattice nodes;

[0019] FIG. 2C is a magnified detail view of the exemplary microlattice of FIG. 2A under further compression, showing increased buckling deformation at microlattice nodes;

[0020] FIG. 3 is perspective view of an exemplary honeycomb layer comprising a component of one embodiment of the present invention;

[0021] FIG. 4 is a magnified detail view of an exemplary fabric layer comprising a component of one embodiment of the present invention; and

[0022] FIG. 5 is frontal view of an exemplary exoskeleton comprising multiple impact resistant structures according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0023] Referring to FIG. 1, an exemplary impact resistant breastplate structure 10 comprises a rigid, shock-deflecting outer layer 11, below which is a deformable, polymer-based microlattice shock-damping layer 12, below which is a semi-rigid, polyurethane honeycomb lattice dissipative layer 13, below which is a lower shock-absorbing fabric layer 14.

[0024] As shown in FIG. 2A, the microlattice layer 12 comprises a three-dimensional network of hollow nanotubes, preferably having tube diameters less than 1 mm. The nanotubes microscopic structure is depicted in FIGS. 2B and 2C, in which the microlattice is under increasing compression, with deformation progressing from incipient buckling at the nodes 15 to more advanced buckling 16. The buckling at the nanotubes' nodes damps impact forces, and the extremely small aspect ratio of the nanotubes' wall thickness to their diameter enables nearly full deformation recoverability.

[0025] FIG. 3 depicts the semi-rigid, polyurethane honeycomb lattice shock-dissipating layer 13, which lies below the microlattice layer 12. Preferably, as shown in FIG. 3, the honeycomb cells are fused together at their walls without interstitial voids. While open hexagonal cells are depicted for illustrative purposes, it should be understood that any open polygonal-shaped cell can be used, although preferably the number of sides of each all should be five or more. Preferably the honeycomb material 13 is thermoplastic polyurethane and the cells are less than 0.5 inch in diameter. In addition to its shock-dissipating function, the semi-rigid, honeycomb material 13 acts as a constraining layer below the microlattice layer 12, thereby increasing shock-damping deformation of the microlattice.

[0026] As shown in FIG. 3, the honeycomb layer attaches to a shock-absorbing lower fabric layer 14, which is depicted in magnified detail in FIG. 4. This layer comprises a base layer of woven fabric 17, consisting of fibers 18 with interstices 19. Between the fibers 18 and the interstices 19 are interwoven carbon nanotubes 20, preferably with tube diameter less than 1 mm. In military/police applications, the base fabric 17 is a ballistic and puncture resistant fiber, such as Kevlar.

[0027] The material composing the rigid, shock-deflecting outer layer 11 of the exemplary breastplate structure 10 can be varied, depending on the application. In sports uses, it is preferably made of a rigid, light-weight, impact-resistant plastic or ceramic material, while in military/police uses, it is preferably composed of a ballistic and puncture resistant material, such as reinforced plastic, titanium metal or aramid fibers.

[0028] As shown in FIG. 5, a complete or partial exoskeleton 21 can be assembled from articulate panels having the multi-layer composite structure of the present invention.

[0029] Although the preferred embodiment of the present invention has been disclosed for illustrative purposes, those skilled in the art will appreciate that many additions, modifications and substitutions are possible, without departing from the scope and spirit of the present invention as defined by the accompanying claims.