The boundary integral equation method for simulating guided waves scattering by a distribution of delaminations in a laminate

In the present study, the boundary integral equation method (BIEM) is extended to calculate eigenfrequencies and to simulate Lamb wave scattering by delaminations in laminates. The delaminations are modelled as a distribution of open micro-cracks and via the spring boundary conditions. The spatial-dependent spring boundary conditions are proposed to simulate a partially closed delamination, e.g. impact induced damage. The eigenfrequencies of a two-layer laminate made from dissimilar materials are calculated and analyzed for cases of uniform and non-uniform distributions of open micro-cracks.