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Propagation behavior of horizontally polarized shear waves (SH-waves) in a piezo-composite structure is discussed, using the Wentzel–Kramers–Brillouin (WKB) method. The considered model is made by combining the Functionally Graded Piezoelectric Material (FGPM) layer and piezoelectric orthotropic substrate. The linear form spring model is considered to delineate the imperfection of interface. Moreover, the material properties of FGPM layer are varying linearly along the thickness direction. Dispersion relation is obtained for both electrically open and short cases. Numerical example and graphical representation have been provided to illustrate the effect of different parameters on the phase velocity of SH-waves. As a special case, dispersion relation has been obtained when the boundary is perfect. Results are compared for different orthotropic materials to add more specific observations. Finally, the outcome of this study is validated by matching it with classical Love wave result. Observations will be helpful in optimization of Love wave sensors and Surface Acoustic Wave (SAW) devices.

This article aims to study the propagation of polarized shear horizontal waves in viscous liquid layer resting over a porous piezoelectric half-space. An analytical solution is proposed using the separation of variables method. The dispersion relation is obtained using the proper boundary conditions for both electrically open and short cases in determinant form. The numerical example and graphical representation are provided in support of the findings. Dynamic response of affecting parameters (e.g. layer’s width, mass density, piezoelectric constant, dielectric constant, viscous coefficient, and dielectric coupling between the two phases of the porous aggregate) has been presented through graphs. It is observed that the phase velocity of considered wave remarkably affected by these parameters. Moreover, obtained result is matched with the existing result. Findings may contribute significantly toward optimization of surface acoustic wave devices and other liquid sensors. Moreover, this study may be utilized to frame a theoretical model for the problems of shear horizontal wave propagation in composite structures, involving piezoelectric medium.