In this study the postbuckling response of a one-dimensioanl delaminated composite beam under axial compression is modeled by the method of differential quadrate. An across-the-width delimitation is considered to be in an arbitrary location through-the-thickness of the beam, and in between he beam's end supports. The formulation incorporates the exact nonlinear curvature of the beam. To model the problem, the delaminated beam is divided into four regions. The buckling is promoted by introducing an initial imperfection along beam. Tehn the nonlinear differential equations describing the four regions of the beam and those defining the edge and interface boundary conditions are covenanted into a set of equivalent differential quadrate form. An arc-length algorithm is used to solve the resulting system of nonlinear equations, and subsequently, the geometrically nonlinear responses of all regions are determined. The numerical results obtained from a series of case studies confirm the efficiency and accuracy of the method.
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