Integrally woven composite fan blade using progressively larger weft yarns

摘要

A composite blade (32) includes a preform (48) and a binder. The preform is a preform of yarns woven in three-dimensions and has a tip region (40), a root region (44) and an intermediate region (42). The intermediate region is positioned between the tip region and the root region. The yarns comprise warp yarns (58) and weft yarns (60). The warp yarns form a longitudinal axis (46). The weft yarns are positioned at a 90 degree angle to the warp yarns. The weft yarns increase in yarn size as determined by filament count along the longitudinal axis to change the thickness of the preform. The binder maintains the relative positions of the preform yarns.