Static and dynamic analysis of multilayer composite plate with piezoelectric elements

In this paper a model of a composite, multi-layer plate with piezoelectric elements (PZT) has been presented. The influence of the stress stiffness matrix ${bf K}_g$ on the results obtained has been shown. The model has been built up by making use of the finite element method (FEM). The issue of numerical calculations corroborated that the forces, which are formed as a result of activation of piezoelectric elements are considerable. These forces cause changes in static and dynamie characteristics of the element under consideration. The forces cause changes in displacements, stresses, natural frequencies and mode shapes as well. The changes in static characteristics arę bigger than changes in dynamie one, moreover, the changes in the natural frequencies are bigger than those in mode shapes.