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In this paper we study numerical modeling of Lamb waves propagation and its interaction with the edges of symmetric delamination in unidirectional orthotropic plate [0]4. The simulations were carried out using ABAQUS CAE by exciting the fundamental A0 Lamb mode in the frequency 300 kHz. The delamination was then characterized by analyzing the signal picked up at two sensors using two technics: two Dimensional Fast Fourier Transform (2D-FFT) to identify the propagating and converted modes, and Wavelet Transform (WT) to measure the arrival times. The results showed that the mode A0 is sensible to symmetric delamination. Besides, based on signal changes with the delamination edges, a localization method is proposed to estimate the position and the length of the delamination.

Numerical characterization of Symmetric Delamination in Orthotropic plate using Lamb waves