Abstract

Combined Effect of Elastic Nonlinearity and Piezoelectricity on Near-Surface Localization of Shear Surface Acoustic Waves

V.G.Mozhaev (Department of Acoustics, Faculty of Physics, Moscow State University, Moscow, Russia)

e-mail: vgmozhaev@mail.ru

Piezoelectricity of solid substrates may result in the appearance of pure shear surface acoustic waves. These waves are mainly referred to as Bleustein-Gulyaev waves in the modern literature. On the other hand, elastic nonlinearity of solids can produce the same effect, that is, it can give rise to surface acoustic waves due to nonlinearity [V. G. Mozhaev, Phys. Lett. A, 1989, v. 139, n. 7, p. 333]. The purpose of the present study is to consider a combined effect of these two factors on the depth profile of shear surface acoustic waves. An analytical solution is found in the case of 6mm piezoelectric substrates. The basic form of the solution (sech-function) is the same as it was previously obtained in nonpiezoelectric case. However, the distinction is present between the zero-value positions of argument of sech-function, that is, there is a shift of this point due to piezoelectricity in the problem under study. Numerical estimations are given for PZT ceramics.

Section : 2