bending of functionally graded sandwich nanoplates resting on ‎pasternak foundation under different boundary conditions

This article proposes a refined higher order nonlocal strain gradient theory for stresses and deflections of new model of functionally graded (fg) sandwich nanoplates resting on pasternak elastic foundation. material properties of the fg layers are supposed to vary continuously through-the-thickness according to a power function or a sigmoid function in terms of the volume fractions of the constituents. the face layers are made of fg material while the core layer is homogeneous and made of ceramic. in this study, an analytical approach is proposed using the higher-order shear deformation plate theory and nonlocal strain gradient theory with combination of various boundary conditions. numerical outcomes are reported to display the impact of the material distribution, boundary conditions, elastic foundation parameters and the sandwich nanoplate geometry on the deflections and stresses of fg sandwich nanoplates. the exactness of this theory is determined by comparing it to other published outcomes.