Abstract
The acoustic signature provided by laser-generated ultrasound in polymer matrix composites is difficult to interpret on account of the dispersive nature of these materials. In order to simulate such wave forms, a double numerical inverse transform is used to calculate the surface displacement generated by a line impact. This calculation method is preferred due to the frequency dependence connected with the viscoelastic rheology. The focusing effects that anisotropy gives rise to are represented. In addition, the spreading of the signals issued from absorption is correlated with the anisotropic changes of the slowness versus frequency. The predicted displacements are in good agreement with the result of experiments performed with a composite plate.
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