This paper deals with buckling analysis of rectangular composite laminates with circular holes under inplane static loadings. The first-order shear deformation theory and the variational energy method are employed in mathematical formulation, and the nine-node Lagrangian finite element method is used for finding critical loads. The effects on critical load by hole size, plate thickness ratio, material modulus ratio, ply lamination geometry, loading types, and boundary conditions are investigated. Numerical solutions are shown in graphical form where some comparisons are made with those of given litera tures.
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