Woven preforms, for example those used for jet aircraft engine fancases, may need additional stiffeners to improve the strength and/or dynamic performance of the preform assembly, as well as to serve as attachment points. The present invention describes several improved woven preforms that include c
Woven preforms, for example those used for jet aircraft engine fancases, may need additional stiffeners to improve the strength and/or dynamic performance of the preform assembly, as well as to serve as attachment points. The present invention describes several improved woven preforms that include circumferential or axial stiffeners, as well as methods of manufacturing the same. One embodiment includes circumferential stiffeners added to a woven preform. Another embodiment includes sub-preforms with integral flanges that combine to make integral stiffeners. A further embodiment includes an intermediate stiffener wrapped onto a base sub-preform wrap, wherein the intermediate stiffener wrap incorporates intermediate stiffeners. Another embodiment incorporates bifurcations in one or more layers of an outermost wrap of a multi-layer fabric composite that forms a preform, wherein the bifurcated outer wrap is folded to form stiffeners that may be oriented circumferentially or axially.
대표청구항▼
1. A woven preform assembly comprising: one or more wraps of a continuous contour woven fabric about a centerline of a mandrel, the mandrel adapted to form a preform base having a predetermined cross-sectional shape, wherein said preform base being contour woven to form a portion of a preform base f
1. A woven preform assembly comprising: one or more wraps of a continuous contour woven fabric about a centerline of a mandrel, the mandrel adapted to form a preform base having a predetermined cross-sectional shape, wherein said preform base being contour woven to form a portion of a preform base first integral flange disposed on a first edge of said woven fabric that forms a first edge circumference around said centerline and at least a portion of a preform base second integral flange disposed on a second edge of said woven fabric that forms a second edge circumference around said centerline; andone or more contour woven fabric layers formed from a plurality of warp fibers woven with a plurality of weft fibers to form matching L-shaped circumferential stiffeners disposed on an outer surface of the preform base between the first and second edges of the woven fabric and at least partially wrapped in contact with the circumference of said preform base,wherein the warp fibers of the contour woven fabric layers forming the circumferential stiffeners are in the circumferential direction and are of differing lengths across the width of the fabric so that the circumferential stiffeners are adapted to have a curvature of the circumference of the preform. 2. The preform assembly of claim 1, wherein any of said fabrics are selected from the group consisting of single-layer fabric and multi-layer fabrics. 3. The preform assembly of claim 1, wherein said circumferential stiffeners comprise one or more wraps of single-layer woven fabric or a multi-layer woven fabric. 4. The preform of claim 1, wherein said circumferential stiffeners are formed from fabrics comprising stretch broken fibers in the warp direction, the weft direction, or in both the warp and weft directions. 5. The preform assembly of claim 4, further comprising one or more lengths of woven material inserted at a bias between any of said layers of woven fabric. 6. The preform assembly of claim 1, wherein said fabric forming said at least one circumferential stiffener wraps one or more times around the centerline to form a complete circumference about said preform base. 7. The preform assembly of claim 1, wherein said fabric forming said at least one circumferential stiffener partially wraps around the centerline to form an arc segment about said preform base. 8. The preform assembly of claim 1, wherein said circumferential stiffeners comprise at least one stiffener wrapping one or more times about the centerline forming a complete circumference about said preform base and at least one stiffener partially wrapping about the centerline forming an arc segment about said circumference. 9. The preform assembly of claim 1, wherein at least some of said circumferential stiffeners are affixed to said preform base by T-forming, tufting, or stitching. 10. The preform assembly of claim 1, wherein through thickness reinforcement of said wraps forming the preform base is provided by T-forming, tufting, or stitching through the wraps of woven fabric. 11. The preform assembly of claim 1, wherein said preform body and said circumferential stiffeners are co-molded. 12. The preform assembly of claim 1, wherein said stiffeners are wrapped about a molded preform base. 13. The preform assembly of claim 1, wherein said woven fabric is made from materials selected from the group consisting of carbon, nylon, rayon, polyester, glass, ceramic, aramid, and polyethylene.
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이 특허에 인용된 특허 (10)
Porte,Alain, Aircraft engine in which there is a small clearance separating the fan cowls and the thrust inverter cowls.
Antuna Eugene J. (Springdale OH) Keck Donald F. (Fairfield OH) Roth Robert H. (Cincinnati OH) Brantley James W. (Fairfield OH) Wakeman Thomas G. (Lawrenceburg IN) Fravel Jeffrey B. (Cincinnati OH) Co, Apparatus for removably attaching a core frame to a vane frame with a stable mid ring.
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