This paper addresses a gap in the literature on the 3-dimensional scattering of the fundamental symmetric Lamb mode SO from delimitations in composite plates. We study the scattering of low-frequency SO Lamb mode from a delamination in a stiffened 4-ply CFRP composite plate with [0/0] s ply orientation. Far field scattering coefficients for the SO Lamb mode are plotted as a function of circumferential position around the delamination using 3D FE simulations. Results show that the delamination size has less influence on SO Lamb wave scattering in the low-frequency regime where the SO mode is non-dispersive. Further analysis was done using two-dimensional FE simulation for different ply-layup orientations with SO Lamb mode. This study shows that ply-layup orientation and through-thickness delamination location in fiber composite laminate have a significant influence on SO Lamb mode interaction. We also analyzed the interaction of AO Lamb mode for a few cases. This work will be useful for practical Lamb wave based inspection of composite plate structures.
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