Propagation of SH-waves in piezoelectric structures with functionally graded coating from different materials

Abstract

The paper proposes an approach to model piezoelectric structures with a coating of various piezoelectric materials. The coating is a layer of functionally graded piezoelectric material, the properties of which continuously change from the parameters of one material to another. In contrast to the layered model with gaps in the change of properties at the interfaces of the materials, the proposed model implements the adjustment of the thickness of the coating of the transition zone of one material to another. The choice of functional dependences of the change in properties was determined by the ratio of the moduli of the materials that make up the coating, the localization of inclusions and the size of the area of mutual penetration of materials. The studies were carried out for piezoelectric structures made of ferroelectric materials based on PZT. In this paper, using the example of a model of coating by two and three piezoelectric materials, we studied the influence of the nature and localization of the inhomogeneity of the coating on the features of the propagation of surface shear horizontally polarized waves.