Abstract
The scattering problem of an incident high-frequency S0 Lamb wave in a plate with a circular blind hole is investigated. The study is not limited to the low-frequency range of this wave, in which the popular approximate plate theories are inapplicable. A 3D analytical approach is used where the wave fields are expanded in all possible Lamb modes, including propagating and evanescent modes. Due to the non-symmetric blind hole defect, the scattered fields will contain higher order converted modes in addition to the fundamental S0 and A0 modes. The far field scattering amplitudes of various propagating Lamb modes for different hole sizes are inspected. The results are compared with those of low frequencies and some different phenomena are found.
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