TY - EJOU AU - Altenbach, H. AU - Eremeyev, V. A. TI - Eigen-vibrations of Plates made of Functionally Graded Material T2 - Computers, Materials \& Continua PY - 2009 VL - 9 IS - 2 SN - 1546-2226 AB - Within the framework of the direct approach to the plate theory we consider natural oscillations of plates made of functionally graded materials taking into account both the rotatory inertia and the transverse shear stiffness. It is shown that in some cases the results based on the direct approach differ significantly from the classical estimates. The reason for this is the non-classical computation of the transverse shear stiffness. KW - functionally graded materials KW - foams KW - plate theories KW - direct approach KW - natural frequencies KW - rotatory inertia KW - effective stiffness KW - transverse shear stiffness DO - 10.3970/cmc.2009.009.153