Modelisation de materiaux piezoelectriques et electrostrictifs par Ia methode des elements finis
Keywords:
pie::oelectricity, electrostriction, electromechanical transduction, electromechanical coupling, finite element methodAbstract
Numerical models used to describe the electromechanical coupling due to pie::oelectric or electrostrictive effects are analysed In the first section, the thermodynamic basis provides constitutive equations of pie::oelectricity and electrostriction in a similar form. The principle of virtual works leads to a unique variational formulation of both effects. This formulation is derived for static and dynamic problems in the second section. The finite element discreti::ation and the application of the variational principle provide linear or nonlinear coupled set of equations. In the third section, two applications are presented: an ultrasonic 110/or made of PZT ceramics for pie::oelectricity, a PMN-PT bar for electrostriction.
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