Attachment for ceramic matrix composite component
First Claim
1. An attaching method comprising:
- forming a ceramic matrix composite structure comprising first and second opposed surfaces and ceramic fibers disposed between the surfaces and oriented in substantial alignment with the surfaces and with a hole extending through the ceramic matrix composite structure;
disposing a bushing in the hole, the bushing comprising a first end with a first flange extending radially beyond the hole against the first surface and a second end with a second flange extending radially beyond the hole against the second surface; and
compressively bracketing the fibers of the ceramic matrix composite structure proximate the hole between the first and second flanges with a preload interlaminar compressive stress of less than five times the interlaminar tensile strength of the ceramic matrix composite structure (<
5σ
ILTENS).
2 Assignments
0 Petitions
Accused Products
Abstract
A bushing (30, 31) in a hole (26) through a ceramic matrix composite structure (20) with a flange (34, 38) on each end of the bushing (30, 31) extending beyond and around the hole and pressing against opposed surfaces (22,24) of the CMC structure (20) with a preload that resists buckling of the composite structure fibers and resists internal CMC fiber separation. A connecting element (40), such as a bolt or pin, passes through the bushing (30, 31) for engagement with a supporting element (50). The bushing (31) may be formed in place as a single piece of ceramic, and cured along with the CMC structure (20), or it may be formed as two ceramic or metal parts (32, 36) that are joined together and preloaded by threads (33). The connecting element (40) may be a pin, or it may be a bolt with a shaft threaded into one part (32) of the bushing and a head (42) that pushes the second flange (38) toward the first flange (34).
89 Citations
20 Claims
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1. An attaching method comprising:
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forming a ceramic matrix composite structure comprising first and second opposed surfaces and ceramic fibers disposed between the surfaces and oriented in substantial alignment with the surfaces and with a hole extending through the ceramic matrix composite structure; disposing a bushing in the hole, the bushing comprising a first end with a first flange extending radially beyond the hole against the first surface and a second end with a second flange extending radially beyond the hole against the second surface; and compressively bracketing the fibers of the ceramic matrix composite structure proximate the hole between the first and second flanges with a preload interlaminar compressive stress of less than five times the interlaminar tensile strength of the ceramic matrix composite structure (<
5σ
ILTENS). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An attaching method comprising:
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forming a ceramic matrix composite structure comprising first and second opposed surfaces and ceramic fibers disposed between the surfaces and oriented in substantial alignment with the surfaces and with a hole extending through the ceramic matrix composite structure; disposing a bushing in the hole, the bushing comprising a first end with a first flange extending radially beyond the hole against the first surface and a second end with a second flange extending radially beyond the hole against the second surface; compressively bracketing the fibers of the ceramic matrix composite structure proximate the hole between the first and second flanges; and forming the ceramic matrix composite structure to additionally comprise a ceramic 3D reinforcing fiber weaved among the ceramic fibers oriented in substantial alignment with the surfaces, the hole interrupting the 3D reinforcing fiber to define a fiber end; wherein the 3D reinforcing fiber end is compressively bracketed between the first flange and the second flange to secure the fiber end relative to the ceramic fibers oriented in substantial alignment with the surfaces. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification