Abstract

Postbuckling behaviors of composite stiffened panel under shear load have been analyzed with Ritz method. The results have been compared with those of finite element analysis. In our research, we assumed that delamination between skin and stiffeners distribute uniformly along stiffeners. Distributions of energy release rate have been calculated based on the results of postbuckling analysis. Distributions of energy release rate are analyzed in several cases and influence of laminate configuration on energy release rate has been shown.

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