The effect of shear deformation and rotatory inertia should betaken into account in modeling Lamb waves in composite laminates. However,the first and second-order shear deformation plate theories which do not satisfythe stresses free boundary condition are uneconomic approximations, becauseone has to develop a complicated scheme to compute the shear correctionfactors. The stresses free boundary condition requires an in-plane displacementfield expanded at least as cubic functions of the thickness coordinate. Hence, inthis paper, the dispersive curves of Lamb waves in laminates are calculatedaccording to a new third-order shear deformation plate theory considering theboundary condition. The lower anti-symmetric Lamb modes results of the newtheory are closest to the exact solutions from 3D elasticity theory compared toseveral existing plate theories.
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