Based on linear and nonlinear in-plane shear formulations for fiber- composite laminate materials, finite-element buckling analyses for composite plates under uniaxial compression and biaxial compression and for composite shells under end com pression and hydrostatic compression are presented. It has been shown that the nonlinear in-plane shear has significant influence on the buckling and postbuckling responses of composite plates and shells, specially for those with [45/-45]2S layup.
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