Abstract
Equations of motion of a simply supported rectangular bimodulus thick plate in which the higher-order shear deformation terms are included are derived. The governing equations obtained using the average stress method are solved in exact form. The natural frequencies are compared with the previous results obtained for ordinary thick plates, and with the neutral surface locations and natural frequencies of bimodular plates. From those comparisons, the effects of higher-order shear deformation terms on the neutral surface locations and the natural frequencies can be observed. Also, the percentage error sense improvement by higher-order deformation terms can be reduced from 1.4 to 0.09%.
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