Shear wave based acoustic devices are being used in gaseous and liquid environments because of their high-sensitivity. The theoretical study of horizontally polarized shear (SH) waves in a layered structure consisting of a piezoelectric ceramic of P ZT − 5H or BaT iO 3 material overlying a couple stress substrate is presented in this paper. The considered substrate is supposed to be exhibiting microstructural properties. The closed form expression of dispersion relations are derived analytically for electrically open and short conditions. The effects of internal microstructures of the couple stress substrate, thickness of P ZT − 5H or BaT iO 3 ceramic, piezoelectric and dielectric constants are illustrated graphically on the phase velocity of the piezoelectric layer under electrically open and short conditions.
This paper presents theoretical investigations of Love waves in a layered structure composed of a layer of finite thickness exhibiting heterogeneities in the form of void pores lying over a couple stress substrate which possesses inner microstructures. The top surface of layer and the interfacial surface between two media are assumed to be sinusoidal corrugated in nature. Dispersion relationships for the propagation of Love waves in the considered model are calculated, and some special cases are also discussed considering different types of conditions at the boundary surfaces. Profiles of wave propagating through a material are affected by microscopic heterogeneities and inner microstructures of the material. So, the impact of various parameters engaged in the problem such as void parameters, corrugation parameter and microstructural parameter of half space called characteristic length parameter is provided on both phase and damping velocities of Love waves. A comparative assessment is provided by depicting all the outcomes for various sub-cases.
The propagation of Love-type wave in multilayered structures plays a vital role for designing of Love wave-based devices. In this present paper, we have considered a theoretical model consisting of a heterogeneous viscoelastic layer lying under a finite layer of piezoelectric medium and lying over size-dependent couple stress substrate. The traction free surface is considered on the top layer of the considered geometry of the problem. The closed form of secular equations are derived for electrically open and short circuits. The impacts of heterogeneity, internal friction related to viscoelastic layer, together with the internal microstructures of couple stress substrate are demonstrated graphically. The effect of piezoelectric medium is displayed by taking
or BaTiO3 materials of the piezoelectric layer. The validation has been carried out for the study, which is in close agreement with the already established results.
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