Free vibration and buckling of bidirectional functionally graded sandwich plates using an efficient Q9 element

Free vibration and buckling of three-phase bidirectional functionally graded sandwich (BFGSW) plates are studied in this paper for the first time by using an efficient nine-node quadrilateral (Q9) element. The core is pure ceramic, while two skin layers a material. element derived on basis Mindlin plate theory linked interpolations. Fundamental frequencies loads computed with various boundary conditions. Numerical result shows that convergence interpolation faster compared to conventional Lagrangian Q9 investigations carried out highlight influence material gradation side-to-thickness ratio behaviour plates.