The imperfection sensitive buckling loads of fibre reinforced polymeric (FRP) composite cylindrical shells under axial compression\r\ncan be optimised with respect to many material and geometric parameters. Current approaches, using mathematical algorithms\r\nto optimise the linearised classical critical loads with respect to many design variables, generally ignore the potential reductions\r\nin elastic load carrying capacities that result from the severe sensitivities of buckling loads to the effects of initial imperfections.\r\nThis paper applies a lower-bound design philosophy called the reduced stiffness method (RSM) to the optimisation design of FRP\r\nshell buckling. A physical optimisation in terms of parametric studies is carried out for simply supported, 6-ply symmetric, glassepoxy\r\ncircular cylindrical shells under uniform axial load. It is shown that under the guidance of RSM, safe lower-bound buckling\r\nloads can be enhanced greatly by choosing appropriate combinations of design parameters. It is demonstrated how this approach\r\nencourages the delineation of those components of the shell�s membrane and bending stiffness that are important and those that\r\nare unimportant within each of the prospective buckling modes. On this basis, it is argued that the RSM provides not only a safe\r\nbut also a more rational strategy for better design decision making.
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