A woven preform for a reinforced composite material, which may be woven flat and folded into shape. The preform has off-axis reinforcement with one or more legs and/or base extending in an off axis or bias (non 0/90 degree) orientation with respect to the warp/weft fibers. One or more legs extend fr
A woven preform for a reinforced composite material, which may be woven flat and folded into shape. The preform has off-axis reinforcement with one or more legs and/or base extending in an off axis or bias (non 0/90 degree) orientation with respect to the warp/weft fibers. One or more legs extend from a base, the base and legs each having at least two layers of warp fibers. The legs may be parallel or angled to each other. The outer ends of the base and/or the legs may have tapers formed from terminating layers of warp fibers in a stepped or angled pattern.
대표청구항▼
1. A woven preform for use in reinforced composite structures, the preform comprising: a first layer of warp fibers;a second layer of warp fibers parallel to the first layer of warp fibers; and one or more layers of weft fibers,wherein the weft fibers are perpendicular to the warp fibers in the firs
1. A woven preform for use in reinforced composite structures, the preform comprising: a first layer of warp fibers;a second layer of warp fibers parallel to the first layer of warp fibers; and one or more layers of weft fibers,wherein the weft fibers are perpendicular to the warp fibers in the first layer and the second layer,wherein the weft fibers are interwoven with the warp fibers of the first layer and the second layer to form a multilayer preform having a base,wherein the warp fibers in the first layer exchange positions with warp fibers in the second layer to form a clevis of a predetermined width,wherein the warp fibers and the weft fibers are at an off axis or bias (non 0/90 degree) angle with respect to the clevis and an edge of the base of the perform. 2. The preform according to claim 1, further comprising two or more legs. 3. The preform according to claim 2, wherein the two or more legs are folded relative to the base, thereby forming upstanding legs. 4. The preform according to claim 3, wherein the two or more legs are separated by a zero or non-zero width clevis. 5. The preform according to claim 2, wherein the base has the same or more layers than each of the legs or vice versa. 6. The preform according to claim 2, wherein edges of the base and/or the legs are tapered. 7. The preform according to claim 2, wherein the legs are perpendicular or non-perpendicular or angled to the base. 8. The preform according to claim 2, wherein the legs are of equal or unequal lengths and/or heights. 9. The preform according to claim 2, wherein the legs are separated by a variable width clevis. 10. The preform according to claim 2, wherein the legs are linear or non-linear along a length of the perform. 11. The preform according to claim 1, wherein the warp and weft fibers are made of glass, carbon, aramid, polyethylene, polypropylene or combinations thereof. 12. The preform according to claim 1, wherein the preform is a Pi, ‘T’, ‘H’ or ‘I’ shaped perform. 13. The preform according to claim 1, wherein the off axis or bias angle is +/−45 degrees. 14. A method of forming a woven preform, the method comprising the steps of: providing a first layer of warp fibers;providing a second layer of warp fibers parallel to the first layer of warp fibers;and providing one or more layers of weft fibers, wherein the weft fibers are perpendicular to the warp fibers in the first layer and the second layer,interweaving the weft fibers with the warp fibers of the first layer and the second layer to form a multilayer perform having a base,wherein the warp fibers in the first layer exchange positions with warp fibers in the second layer to form a clevis of a predetermined width,wherein the warp fibers and the weft fibers are at an off axis or bias (non 0/90 degree) angle with respect to the clevis and an edge of the base of the perform. 15. The method according to claim 14, further comprising the step of cutting a predetermined length and width of the woven preform. 16. The method according to claim 15, further comprising the step of folding a portion of the woven preform on either sides of the clevis to form two or more upstanding legs. 17. The method according to claim 16, wherein the base has the same or more layers than each of the legs or vice versa. 18. The method according to claim 16, wherein edges of the base and/or the legs are tapered. 19. The method according to claim 16, wherein the legs are perpendicular or non-perpendicular or angled to the base. 20. The method according to claim 16, wherein the legs are of equal or unequal lengths and/or heights. 21. The method according to claim 16, wherein the two or more legs are separated by a zero or non-zero width clevis. 22. The method according to claim 16, wherein the legs are separated by a variable width clevis. 23. The method according to claim 16, wherein the legs are linear or nonlinear along a length of the preform. 24. The method according to claim 14, wherein the warp and weft fibers are made of glass, carbon, aramid, polyethylene, polypropylene or combinations thereof. 25. The method according to claim 14, wherein the preform is a Pi, ‘T’, ‘H’ or ‘I’ shaped preform. 26. The method according to claim 14, wherein the off axis or bias angle is +/−45 degrees.
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