Influence de la porosité sur la vibration libre des plaques FGM sur fondation élastique.

In this paper, an analytical solution is presented for vibration behaviour analysis of functionally graded materials plates (FGM). During manufacture of these plates, defects such as porosities can appear. Those can change the entire behaviour of these plates. A method based on a higher shear deformation theory will be presented to study the free vibration of FGM plates resting on elastic foundation. Two different porosity distributions through thickness direction of plate will be retained. The elasticity moduli and mass density of these plates are assumed to be graded in the thickness direction according two distribution patterns. The governing equations are obtained through the Hamilton's principal and the closed form solutions in terms of natural frequencies are obtained by using Navier technique. The numerical results obtained through the present analysis are compared with the ones available in the literature, and a parametric study is carried out to investigate the influence of the varying porosity distributions on the vibration response of FGM plates resting on elastic foundation. [ABSTRACT FROM AUTHOR]