Analytical study of electro-mechanical parameters on Love wave in an imperfectly bonded VPCM layered structure

Abstract

This study is carried out to investigate the mechanical and electrical characteristics of Love waves in a visco-piezo-composite medium bounded between an orthotropic upper stratum and an elastic substrate of conducting type medium. The mechanically imperfect boundary conditions have been considered for both the interfaces of the sandwiched stratum. By solving coupled electromechanical field equations analytically, the electric potential, and mechanical displacement are obtained for the respective medium. After that, by using the relevant boundary conditions, the expression of dispersion has been established. The effect of various parameters such as viscosity, piezo-electric, dielectric, imperfection parameter, thickness ratio parameters on phase velocity, and attenuation coefficient of Love waves have been discussed. For the validation of our solution, the classical Love wave equation is obtained in the limiting sense (i.e. in the absence of piezoelectricity, upper surface, viscosity, imperfection parameters). To date, nobody has considered a Voigt-type viscous effect in composite piezo-structure to study Love wave propagation, even in the latest research works. Results indicate that the piezo-electric parameter possesses a great positive impact on phase velocity and attenuation coefficient. The attenuation co-efficient converges to some constant magnitude for different values of the thickness ratio parameter. The present investigation may find various applications in many problems of automatic remote control, space exploration, and piezoelectric ceramic devices. Moreover, it can be used in the investigation of the deformation and mechanical behavior of the sedimentary rock.