Methodology and Tooling Arrangements for Increasing Interlaminar Shear Strength in a Ceramic Matrix Composite Structure
First Claim
1. A method of fabricating a ceramic matrix composite structure, said method comprising:
- forming a ceramic matrix composite including a plurality of layers of ceramic fibers disposed between a top surface and a bottom surface of the composite structure;
urging each of the surfaces of the composite structure against corresponding top and bottom surfaces of a tool having a plurality of asperities;
as a result of said urging, the asperities forming a plurality of surface recesses on the surfaces of the structure, wherein the plurality of the surface recesses causes an out-of-plane sub-surface fiber displacement arranged to increase an interlaminar shear strength of the structure.
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Abstract
Methodology and tooling arrangements for increasing interlaminar shear strength in a ceramic matrix composite (CMC) structure are provided. The CMC structure may be formed by a plurality of layers of ceramic fibers disposed between a top surface and a bottom surface of the composite structure. A plurality of surface recesses are formed on the surfaces of the structure. For example, each of the surfaces of the composite structure may be urged against corresponding top and bottom surfaces of a tool having a plurality of asperities. The plurality of surface recesses causes an out-of-plane sub-surface fiber displacement along an entire thickness of the structure, and the sub-surface fiber displacement is arranged to increase an interlaminar shear strength of the structure.
18 Citations
19 Claims
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1. A method of fabricating a ceramic matrix composite structure, said method comprising:
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forming a ceramic matrix composite including a plurality of layers of ceramic fibers disposed between a top surface and a bottom surface of the composite structure; urging each of the surfaces of the composite structure against corresponding top and bottom surfaces of a tool having a plurality of asperities; as a result of said urging, the asperities forming a plurality of surface recesses on the surfaces of the structure, wherein the plurality of the surface recesses causes an out-of-plane sub-surface fiber displacement arranged to increase an interlaminar shear strength of the structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A ceramic matrix composite structure comprising:
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a plurality of layers of ceramic fibers disposed between a top surface and a bottom surface of the composite structure; and a plurality of surface recesses formed on the surfaces of the structure, wherein the plurality of the surface recesses causes an out-of-plane sub-surface fiber displacement along an entire thickness of the structure, wherein the sub-surface fiber displacement is arranged to increase an interlaminar shear strength of the structure. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification