Abstract

This paper presents a new one-variable formulation for free vibrations of thick orthotropic rectangular plates and laminates. This formulation has an additional assumption on the basis of the first-order theory by Mindlin, however, the number of independent variables is only two and there is only one fundamental variable. Exact solutions of simply supported laminates are obtained. Comparison and discussions of the numerical results yield some conclusions regarding the validity of the assumptions of this formulation.

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