Abstract
Analysis for stress and deformation of sandwich plate consist of a functionally graded core and faces made of piezoelectric materials are proposed in this article. The plate is under hygro-thermo-electro-mechanical sinusoidal loadings. Two-variable shear deformation plate theory is applied to express the displacement components. The electric potential distribution is composed of a linear function along the thickness direction and a polynomial function along the plane coordinate. The governing equations and the boundary conditions are found by applying the virtual work principle. Navier's solution is applied to solve the considered problem. The influence of applied voltage, material anisotropy, side-to-thickness ratio, aspect ratio, thermal expansion coefficients, moisture concentration coefficients and inhomogeneity parameter are discussed. The efficiency and exactness of the results is established by comparison with available results.