Multi-functional protective assemblies, systems including protective assemblies, and related methods

Patent metadata

Field	Value
Publication number	US-11077627-B2
Application number	US-201816103428-A
Country	US
Kind code	B2
Filing date	Aug 14, 2018
Priority date	Aug 14, 2017
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

A protective assembly comprises a first region formulated and configured to provide protection from alpha, beta, and electromagnetic radiation and comprising a composite of particles and polymer; a second region formulated and configured to provide protection from ballistic impact and comprising a composite of fibers and polymer; and a third region formulated and configured to provide protection from thermal radiation and comprising a composite of particles, fiber, and polymer. The protective assembly may be provided on an aerospace structure. The protective assembly may be formed on the aerospace structure body using a co-curing process.

First claim

What is claimed is:

1. A protective assembly, comprising:
a first region comprising a composite of particles and polymer, the first region formulated and configured to provide protection from alpha, beta, and electromagnetic radiation;
a second region comprising a composite of fibers and polymer, the second region formulated and configured to provide protection from ballistic impact; and
a third region comprising a composite of particles, fibers, and polymer, the third region formulated and configured to provide protection from thermal radiation;
wherein each of the first region, the second region, and the third region comprises a common polymer.

2. The protective assembly of claim 1 , further comprising an additional region comprising at least one of a metallic mesh or a metallic foil, wherein the additional region is formulated and configured to provide protection from at least one of electrostatic discharge and electromagnetic discharge.

3. The protective assembly of claim 2 , wherein the at least one of the metallic mesh or the metallic foil comprises at least one of silver, copper, aluminum, nickel, and iron.

4. The protective assembly of claim 2 , wherein the additional region comprises the metallic mesh and a polymer, the polymer of the additional region comprising the common polymer of the first region, the second region, and the third region.

5. The protective assembly of claim 2 , wherein the common polymer is continuous at a bond interface between adjacent regions of the first region, the second region, the third region, and the additional region to form a substantially indistinct interface therebetween.

6. The protective assembly of claim 2 , wherein a bond interface between adjacent regions of the first region, the second region, the third region, and the additional region comprises a chemical bond interface.

7. The protective assembly of claim 2 , wherein the first region, the additional region, the second region, and the third region are provided sequentially over an outer surface of an aerospace structure, the first region comprising an innermost region of the protective assembly and the third region comprising an outermost region of the protective assembly.

8. The protective assembly of claim 1 , wherein the common polymer comprises an ethylene acrylic elastomer.

9. The protective assembly of claim 8 , wherein at least one of the first region, the second region, and the third region comprises an ethylene acrylic elastomer foam.

10. The protective assembly of claim 1 , wherein the fibers of the second region and the third region comprise aramid fibers.

11. The protective assembly of claim 1 , wherein the particles of the first region comprise particles of a high-Z metal.

12. A protective assembly, comprising:
a first region comprising a composite of reinforcing material in a matrix material, the first region formulated and configured to provide protection from alpha, beta, and electromagnetic radiation;
a second region comprising a composite of reinforcing material in a matrix material, the second region formulated and configured to provide protection from ballistic impact; and
a third region comprising a composite of particles and fiber in a matrix material, the third region formulated and configured to provide protection from thermal radiation;
wherein the matrix material of at least two of the first region, the second region, or the third region comprises a substantially similar material.

13. The protective assembly of claim 12 , wherein the matrix material of the at least two of the first region, the second region, and the third region comprises a substantially continuous material at an interface between the at least two of the first region, the second region, and the third region.

14. An aerospace structure comprising:
an aerospace structure body; and
a protective assembly formed on an exterior surface of the aerospace structure body, the protective assembly comprising:
a first region comprising a composite of particles and polymer, the first region formulated and configured to provide protection from alpha, beta, and electromagnetic radiation;
a second region comprising a composite of fibers and polymer, the second region formulated and configured to provide protection from ballistic impact; and
a third region comprising a composite of particles, fiber, and polymer, the third region formulated and configured to provide protection from thermal radiation;
wherein at least two of the first region, the second region, or the third region comprises a common polymer.

15. The aerospace structure of claim 14 , wherein the protective assembly is co-cured such that a chemical bond exists at an interface between adjacent regions of the first region, the second region, and the third region.

16. The aerospace structure of claim 14 , wherein the aerospace structure body comprises a fiber-reinforced composite body.

17. The aerospace structure of claim 16 , wherein the protective assembly is co-cured to the aerospace structure such that a chemical bond exists at an interface between the aerospace structure body and the protective assembly.

18. A method of forming a protective assembly for an aerospace structure, comprising:
mounting a protective assembly over an aerospace structure body, the protective assembly comprising:
a first region comprising a composite of particles and polymer, the first region formulated and configured to provide protection from alpha, beta, and electromagnetic radiation;
a second region comprising a composite of fibers and polymer, the second region formulated and configured to provide protection from ballistic impact; and
a third region comprising a composite of particles, fiber, and polymer, the third region formulated and configured to provide protection from thermal radiation;
wherein the first region, the second region, and the third region are each provided in an at least partially uncured state; and

co-curing the protective assembly to form a chemical bond between adjacent regions of the first region, the second region, and the third region and to attach the protective assembly to the aerospace structure body.

19. The method of claim 18 , further comprising positioning a fourth region comprising a metallic mesh and polymer over the aerospace structure body, the fourth region formulated and configured to provide protection from electrostatic pulses.

20. The method of claim 19 , wherein mounting the protective assembly over the aerospace structure body comprises mounting at least one of the first region, the second region, the third region, and the fourth region to an at least partially uncured fiber-reinforced composite structure using a hand lay-up process.

21. The method of claim 18 , further comprising applying a compressive force on the protective assembly toward the aerospace structure body while co-curing the protective assembly.

22. The method of claim 18 , further comprising selecting the polymer of each of the first region, the second region, and the third region to comprise an ethylene acrylic elastomer.

Assignees

• Northrop Grumman Systems Corp

Inventors

• Stone Steven F
• Armentrout Matt
• Deemer Christopher
• Madsen Carl
• Barber Brian

Classifications

• B64G1/54 Primary

  Protection against radiation · CPC title

• G21F1/106

  metallic dispersions · CPC title

• F41H5/0435

  the additional layers being only fibre- or fabric-reinforced layers · CPC title

• B64G1/226

  Special coatings for spacecraft · CPC title

• B32B2398/20

  Thermoplastics · CPC title