Abstract

This article will investigate the influence of the thickness hy to the dynamic characteristic (the natural circular frequency) of rectangular plates. We have used the classical thin plate theory of Kirchhoff, the first-order shear deformation theory for thick plates of Mindlin - Reissner and the finite element method to solve the free vibration problem of plates. The influence of shear deformation in the theory of Mindlin and the rotatory inertia in both two plate theories to natural frequencies are also included.