Wave propagation and thickness vibrations in two−layered piezoelectric plates are investigated by the three−dimensional theory of piezoelectricity and approximate theories. Piezoelectric materials of hexagonal symmetry are considered. The sixfold axes of the materials are assumed to be parallel or perpendicular to the plate. Dispersion curves and frequencies for thickness vibrations are presented. The electromechanical coupling effect is examined and
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Cheng et al. (1975) studied this question.
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