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• May 11, 2020 Create Date
• May 11, 2020 Last Updated

Developments of advanced fiber-composite laminates as viable structural components have introduced new complexities in design. Among these concerns is the load-bearing capacity of these structures under multiaxial compressive loading. In this study deformations and transverse shear stresses at buckling and in the postbuckling range are analyzed to study the compressive failure behavior of thin- and thick-section composite laminates. The general formulation for buckling and postbuckling is based on Newton/Raphson and Riks algorithms used in conjunction with a nonlinear large deformation finite-element method. In order to assess the effect of transverse shear on the buckling and postbuckling behavior a deformable shear plate formulation is used. The global load-deformation response and the transverse shear development in the composite laminates during buckling and postbuckling are studied. Potential changes in buckling mode in postbuckling are especially considered. Effects of thickness, imperfection sensitivity, stress-biaxiality ratio, boundary conditions and lamination layup on global buckling and postbuckling response and on transverse shear development are also analyzed.