Layout and manufacturing method for fiber-reinforced composite shells

摘要: A layout and manufacturing method for fiber-reinforced, laminated composite shells utilizes as a reinforcement nested assembly of braided sleeves. The original sleeve diameters are selected individually such that, upon being deformed into the final shape, fibers acquire angular orientations prescribed by shell design. Shells desired shapes obtained either pulling sleeves on rigid mandrel or, alternately, statically defoming assembly, thereby eliminating use mandrels. statical means involve proper combinations tensile edge forces surface loads exerted, e.g., pressurized bladder or spinning assembly. In one embodiment, tensioned and, if necessary, vibrated prior to matrix curing so force approach geodesic trajectories (isotensoid layout). By releasing tension after curing, favorable compressive prestress is induced in material. Tension levels can be designed produce transverse (interlaminar) normal stress component enhancing resistance delamination. shaped may used subsequent filament winding remain permanent core shell.