Abstract
Absfrucf-A method ol the solution of scattering of the fundamental symmetric Lamb wave in an elastic plate waveguide is described. The approach is a combination of the finite-element and the analytical method. The numerical examples on the scattering by a wedge-shaped internal crack and a wedge-shaped surface crack in a plate are given. The reflection coefficient of the internal crack is considerably influenced by the wedge apex angle and the resonance phenomena arise in the region of the crack. On the other hand, the reflection coefficient of the surface crack is not very much affected by the wedge apex angle. The validity of the method is confirmed by comparing numerical results for an infinitely thin internal crack normal to the surface of a plate with the results of the variational method.
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