PCDsPiezoelectric materials generate a charge on the surface afterapplying a mechanical stress on it. The charge is roughly propor-tional to the force. This is called the direct piezoelectric effect. Thepotentials and the associated currents in piezoelectric materialsare functions of the continuously changing mechanical deforma-tions practically used in situations involving dynamic strains of anoscillatory nature [20]. In reverse the shape of a thin piezoelectricfilm of thickness tpwhich has electrodes on its top and bottom sur-faces is deformed if an input voltage V is applied across the film. Ifthe piezoelectric film is used as an actuator, the film works underac as well as dc voltage, since charges are supplied from a voltagesource [21] and the film is deformed. The most used response ofthe piezoelectric films to the applied voltage is studied in the par-allel direction (3-direction) of the electric field which causes thechanges (elongation) of thickness, tp, expressed as tp. If the filmis on a frictionless surface, a strain in 3-direction is developed andcan be expressed as