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A SIMPLE QUASI-3D SINUSOIDAL SHEAR AND NORMAL DEFORMATIONS THEORY FOR THE HYGRO-THERMO-MECHANICAL BENDING OF FUNCTIONALLY GRADED PIEZOELECTRIC (FGP) PLATE IS DEVELOPED UNDER SIMPLY-SUPPORTED EDGE CONDITIONS. THE GOVERNING EQUATIONS ARE DEDUCED BASED ON THE PRINCIPLE OF VIRTUAL WORK. THE EXACT SOLUTIONS FOR FGP PLATE ARE OBTAINED. THE CURRENT STUDY INVESTIGATES THE EFFECT OF SOME PARAMETERS, LIKE PIEZOELECTRICITY, HYGROTHERMAL PARAMETER, GRADIENT INDEX AND ELECTRIC LOADING ON THE MECHANICAL AND ELECTRIC DISPLACEMENTS, ELECTRIC POTENTIAL AND STRESSES. THEY ARE EXPLORED ANALYTICALLY AND NUMERICALLY PRESENTED AND DISCUSSED IN DETAIL. THE NUMERICAL RESULTS CLEARLY SHOW THE EFFECT OF PIEZOELECTRIC AND HYGROTHERMAL PARAMETER ON THE FGP PLATE.
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