The buckling analysis of laminated composite plates under combined stresses was presented by using the Pb-2Ritz functions, which consist of the product of a basic function and a two dimensional polynomial function. The out-plane shear deformation was also taken into consideration in this analysis. It was shown that the convergence of solutions for the buckling load was good when the number of polynomials was more than 20. Numerical results were obtained for cross-ply and angle-ply laminated composite plates under combined stresses. The effects of material properties, plate aspect ratio, number of layers and lamination angle on buckling load were also investigated under simple supported, clamped edges and combined edge conditions. It was shown that the presented method considering the out-of-plane shear deformation could be widely used to analyze the buckling behavior of composite plates with general boundary conditions.
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