The stiffener or stringer 40 comprises a longitudinal direction and a run-out region 41 which terminates at an end of the stiffener, has a constant section region 42 inboard of the run-out region in the longitudinal direction and having a constant cross section transverse to the longitudinal direction with a crown 43 between adjacent foot portions 44a, 44b. In the run-out region, the crown reduces in height towards the end of the stiffener forming a ramp, the composite stiffener comprises a number of blankets of non-crimp fabric layers. The run-out region may include one or more woven fabric layers and a transition region 50 may include a plurality of blankets of non-crimp fabric layers sandwiched between woven fabric layers, at least one of the blankets of non-crimp fabric layers is dropped off in the transition region. A method of manufacturing a stiffener, comprising laying up a plurality of blankets of non-crimp fabric layers and woven fabric layers and co-infusing with resin and co-curing is also provided.
Composite stiffener
2020-09-02
Patent
Electronic Resource
English