Analysis of surface wave propagation in composite structures with corrugated interfaces

A theoretical framework is constructed to examine the transmission of shear-horizontal (SH) waves in a stacked composite configuration. The system consists of a functionally graded piezoelectric material (FGPM) layer positioned between a porous piezoelectric medium (PPM) and a pre-stressed orthotropic half-space, with the interfaces joined through a corrugated boundary. The displacement components in all three medium are obtained using the separation of variables method. For both electrically open and short-circuit surface conditions, frequency relation is obtained. Several limiting cases are also derived. To validate the theoretical model, numerical simulations and graphical illustrations are provided. The study further explores the influence of various factors, including the gradient coefficient of the FGPM layer, its width, piezoelectric and dielectric constants, dielectric coupling between two phases of porous aggregate, and the corrugation parameter. The findings reveal that the phase velocity of SH-waves shows strong dependence on these parameters. In general, the suggested model provides a theoretical foundation as well as possible practical uses, especially in the advancement of surface acoustic wave (SAW) devices.