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Optimal design of laminated-composite circular-cylindrical shells subjected to combined loads. (English) Zbl 0662.73069
Optimization of the buckling load of a laminated-composite, circular- cylindrical shell subjected to axial compression, external pressure, torsion, or a combination thereof is undertaken. In the optimization procedure it is assumed that the shell has a fixed weight (length, radius and thickness); the buckling load is taken as the objective function which is maximized by adopting the lamina fiber orientations as the optimizing parameters. For the shell analysis a perturbation approach is used and the boundary conditions and nonlinear prebuckling effects are included; the analysis yields both the buckling load and the post- buckling character of the shell. The procedure developed is demonstrated for eight loading configurations. In addition, selected laminates were chosen for an experimental programme involving a series of graphite/epoxy shells. The predicted analytical and the measured experimental buckling loads are in very good agreement.
MSC:
74P99Optimization in solid mechanics
74G60Bifurcation and buckling
74K15Membranes (solid mechanics)