| 摘要 |
Woven preforms, for example those used for jet aircraft engine fancases, may need additional stiffeners (301, 302) 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 manufacturing methods for woven preforms that include circumferential or axial stiffeners. 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. |
