M.J Khoshgoftar, - Assistant Professor, Department of Mechanical Engineering, Faculty of Engineering, Arak University, Arak, Iran
M Bahrami - MSc Student, Department of Mechanical Engineering, Faculty of Engineering, Arak University, Arak, Iran

Free Vibration analysis of piezoelectric laminated composite plate by applying improved zigzag theory is studied in this paper. The laminated plate is consisted of three layers. An orthotropic layer is surrounded with two piezoelectric layers. Governing equations and boundary values are obtained by virtual work principle. The Galerkin method is applied for numerical results. Natural frequencies are obtained for rectangular palate with simply support boundary conditions.

zigzag theory, free vibration, piezoelectric layer, laminated composites