Bleustein-Gulyaev waves in strained piezoelectric ceramics

The propagation of Bleustein-Gulyaev (B-G) waves in ceramics under finite biasing mechanical fields is studied. The theory of small electromechanical fields superposed on a finite bias is employed. It is shown that under finite extensional biasing fields, a one-dimensional component surface wave can still propagate and is governed by two differential equations that are solved analytically. The frequency equation that determines the wave speed is obtained. Some observations are made and a few special cases are discussed.