Third M.I.T. Conference on Computational Fluid and Solid Mechanics June 14–17, 2005  

Dynamic bending and domain wall motion in piezoelectric laminated actuators under ac electric fields

Y. Shindo*, F. Narita, M. Mikami, K. Hayashi
Department of Materials Processing, Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-02, Sendai 980-8579, Japan

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We investigate the nonlinear electromechanical response of piezoelectric laminated actuators under alternating current (ac) electric fields both analytically and experimentally. A laminated beam theory solution is developed for the cantilever piezoelectric/metal/piezoelectric actuator, and the effects of ac electric fields on the deflection are analyzed. A simple phenomenological model of a vibrating domain wall in electric fields is used, and the macroscopic actuator response is predicted. A nonlinear three-dimensional finite element model is also developed. Bending tests are used to validate the predictions using bimorph-type bending actuators made with soft lead zirconate titanate (PZT) layers and a metal sheet. Theoretical predictions of the dynamic bending behavior are in excellent agreement with measured values.

Keywords:  Elasticity; Finite element method; Material testing; Piezocomposite; Beam; Dynamic bending; Domain wall motion; Smart materials

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