M karimi darani - Department of Engineering, Colleg of Engineering, Fereydan Brabch , Islamic Azad University, Isfahan, Iran
A Ghasemi - Department of Engineering, Colleg of Engineering, Fereydan Brabch , Islamic Azad University, Isfahan, Iran

This paper presents the governing equations on the rectangular plate with the variation of material stiffness through their thick using higher order shear deformation theory (HSDT). The governing equations are obtained by using Hamilton s principle with regard to variation of Young s modulus in through their thick with regard sinusoidal variation of the displacement field across the thickness. In addition, the effects of the substances in FG-porous plate are investigated.                                  

Functionally Graded Materials, Navier solution, Porous material, Rectangular plate