Bleustein-Gulyaev waves in strained piezoelectric ceramics (Q1348227)

The author studies the propagation of Bleustein-Gulyaev waves in ceramics under finite biasing mechanical fields. The theory of small electromechanical fields superposed on a finite bias is employed. It is shown that under finite extensional biasing fields a displacement component surface wave can still propagate and is governed by two differential equations. The equations are solved analytically. The frequency equation that determines the wave speed is obtained. Some observation are made, and special cases are discussed. The results are potentially useful for determining nonlinear material constants of ceramics in experiments.