A semi-analytical method incorporating various displacement based formulations has been developed to investigate propagation of time harmonic waves in fiber reinforced polymer composite laminated plates. Various displacement based models starting from the first order shear deformation theory to the fourth order theory have been developed using combinations of linear, quadratic, cubic and quartic variation of axial and transverse displacements through the thickness of a lamina. Different displacement based formulations have been validated by comparing their results with the analytical results available in the literature for wave propagation in an isotropic plate. Results obtained using various displacement models are compared. It has been observed that the higher order displacement based theory using cubic variation of in-plane and transverse displacements through the thickness of lamina is the most accurate and economical one for analyzing wave propagation in composite laminated plates.
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