We study scattering effects caused by 2-D cracks and elastic inclusions. To this aim we use two different numerical approaches. On the one hand we apply the Indirect Boundary Element Method (IBEM) to model the diffraction of SH waves by arbitrary shaped, zero-thickness cracks. We validate the IBEM with an analytic solution for a simple case. On the other hand we use the Direct Solution Method (DSM) to study scattering of SH waves by elastic inclusions. The DSM is based on solving the weak form (Galerkin formulation) of the elastic equation of motion. Although both methods work in the frequency domain, we show results in the time domain obtained by means of the Fast Fourier Transform.
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