Hybrid metal composite structures, joint structures, and related methods

Patent metadata

Field	Value
Publication number	US-10954891-B2
Application number	US-201816035020-A
Country	US
Kind code	B2
Filing date	Jul 13, 2018
Priority date	Jul 13, 2018
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

A multi-component structure includes a first hybrid metal composite structure, a second hybrid metal composite structure, and a joint structure. The first and second hybrid metal composite structures include layers, each layer comprising a fiber composite material structure including a fiber material dispersed within a matrix material and at least one metal ply located between layers of the layers. The joint structure extends between and connects the first hybrid metal composite structure and the second hybrid metal composite structure. Additionally, the joint structure exerts a clamping force on the first and second hybrid metal composite structures and to reduce gaps between the layers, between the layers and the at least one metal ply, and between the joint structure and the first and second hybrid metal composite structures to less than half a thickness of the at least one metal ply.

First claim

What is claimed is:

1. A multi-component structure, comprising:
a first hybrid metal composite structure and a second hybrid metal composite structure, each of the first and second hybrid metal composite structures comprising:
layers comprising a fiber composite material structure; and
at least one metal ply located between the layers; and

a joint structure extending between and connecting the first hybrid metal composite structure and the second hybrid metal composite structure, the joint structure comprising:
a first connector structure disposed on a first side of the first hybrid metal composite structure and the second hybrid metal composite structure and extending between the first hybrid metal composite structure and the second hybrid metal composite structure;
a second connector structure disposed on a second opposite side of the first hybrid metal composite structure and the second hybrid metal composite structure and extending between the first hybrid metal composite structure and the second hybrid metal composite structure;
a first principal fastener extending from the first connector structure, through the first hybrid metal composite structure, and to the second connector structure; and
a second principal fastener extending from the first connector structure, through the second hybrid metal composite structure, and to the second connector structure,
wherein each of the first and second connector structures comprises raised portions for seating the first and second principal fasteners, the raised portions extending outward from the first and second connector structures in a direction parallel to directions in which the first and second principal fasteners extend through the first and second hybrid metal composite structures,

wherein the joint structure is configured to exert a clamping force on the first and second hybrid metal composite structures to reduce gaps between the layers of the first and second hybrid metal composite structures, between the layers and the at least one metal ply of the first and second hybrid metal composite structures, and between the joint structure and the first and second hybrid metal composite structures to less than half a thickness of the at least one metal ply.

2. The multi-component structure of claim claim 1 , wherein the joint structure further comprises:
a first set of plates disposed on opposite sides of the first hybrid metal composite structure and disposed between the first hybrid metal composite structure and the first and second connector structures;
a first set of fasteners extending between the first set of plates and through the first hybrid metal composite structure;
a second set of plates disposed on opposite sides of the second hybrid metal composite structure and disposed between the second hybrid metal composite structure and the first and second connector structures; and
a second set of fasteners extending between the first set of plates and through the first hybrid metal composite structure.

3. The multi-component structure of claim 1 , wherein each of the first and second connector structures comprises a ring.

4. The multi-component structure of claim 1 , wherein each of the first and second connector structures comprises a plate.

5. The multi-component structure of claim 1 , wherein each of the first and second principal fasteners comprises a floating pin.

6. The multi-component structure of claim 1 , wherein the joint structure is configured to exert a clamping force on the first and second hybrid metal composite structures to reduce gaps between the layers of the first and second hybrid metal composite structures, between the layers and the at least one metal ply of the first and second hybrid metal composite structures, and between the joint structure and the first and second hybrid metal composite structures to less than a fourth of a thickness of the at least one metal ply.

7. The multi-component structure of claim 1 , wherein the joint structure is configured to exert a clamping force on the first and second hybrid metal composite structures to reduce gaps between the layers of the first and second hybrid metal composite structures, between the layers and the at least one metal ply of the first and second hybrid metal composite structures, and between the joint structure and the first and second hybrid metal composite structures to less than an eighth of a thickness of the at least one metal ply.

8. The joint structure of claim 1 , wherein the joint structure is configured to exert a clamping force on the first and second hybrid metal composite structures to reduce gaps between the joint structure and the first and second hybrid metal composite structures to less than 0.005 inch.

9. The joint structure of claim 1 , wherein the joint structure is configured to exert a clamping force on the first and second hybrid metal composite structures to reduce gaps between the joint structure and the first and second hybrid metal composite structures to less than 0.0025 inch.

10. The joint structure of claim 1 , wherein the joint structure is configured to exert a clamping force on the first and second hybrid metal composite structures to at least substantially eliminate gaps between the joint structure and the first and second hybrid metal composite structures.

11. The joint structure of claim 1 , wherein the first principal fastener extends through metal plies within the first hybrid metal composite structure, and wherein the second principal fastener extends through metal plies within the second hybrid metal composite structure.

12. The joint structure of claim 1 , wherein at least one of the first and second principal fasteners comprises a bolt comprising a countersink head and a threaded retaining member.

13. A rocket motor, comprising:
a first hybrid metal composite structure and a second hybrid metal composite structure, each of the first and second hybrid metal composite structures comprising:
layers comprising a fiber composite material structure; and
at least one metal ply located between layers of the layers; and

a joint structure extending between and connecting the first hybrid metal composite structure and the second hybrid metal composite structure, the joint structure comprising:
a first connector structure disposed on a first side of the first hybrid metal composite structure and the second hybrid metal composite structure and extending between the first hybrid metal composite structure and the second hybrid metal composite structure;
a second connector structure disposed on a second opposite side of the first hybrid metal composite structure and the second hybrid metal composite structure and extending between the first hybrid metal composite structure and the second hybrid metal composite structure;
a first principal fastener extending from the first connector structure, through the first hybrid metal composite structure, and to the second connector structure; and
a second principal fastener extending from the first connector structure, through the second hybrid metal composite structure, and to the second connector structure,
wherein each of the first and second connector structures comprises raised portions for seating the first and second principal fasteners, the raised portions extending outward from the first and second connector structures in a direction parallel to directions in which the first and second principal fasteners extend through the first and second hybrid metal composite structures; and

wherein the joint structure exerts a clamping force on the first and second hybrid metal composite structures and reducing gaps between the layers of the

Assignees

• Northrop Grumman Innovation Systems Inc

Inventors

• Garcia Benjamin W C
• Christensen Brian
• Nelson David R

Classifications

• B64G1/002

  Launch systems · CPC title

• B32B7/08

  by mechanical means · CPC title

• B32B27/08

  of synthetic resin · CPC title

• B32B2262/0246

  Acrylic resin fibres · CPC title

• B32B2262/106

  Carbon fibres, e.g. graphite fibres · CPC title