Pi-shaped preform with bias fibers

摘要

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.

主权项

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.