The priority of this paper is to obtain the exact analytical solution for free flexural vibration of FGPM beam actuated using the d_(15) effect. In piezoelectric actuators, the potential use of d_(15) effect has been of particular interest for engineering applications since shear piezoelectric coefficient d_(15) is much higher than the other piezoelectric coupling constants d_(31) and d_33. The applications of shear actuators are to induce and control the flexural vibrations of beams and plates. In this study, a modified Timoshenko beam theory is used where electric potential is assumed to vary sinusoidaly along the thickness direction. The material properties are assumed to be graded across the thickness in accordance with power law distribution. Hamilton's principle is employed to obtain the equations of motion along with the associated boundary conditions for FGPM beams. Exact analytical solution is derived thus obtained equations of motion. Results for clamped-clamped and clamped-free boundary conditions are presented. The presented result and method shell serve as benchmark for comparing the results obtained from the other approximate methods.
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