Abstract
The diffraction of SH waves by two-dimensional surface cracks in isotropic plates is studied in two different ways. First, a variational integral expression is used to calculate the reflection coefficients of the propagating modes. fields away from the crack are then obtained using modal superposition. Second, a combined finite element-analyticai technique is used to calculate the scattered fields. The results of the two calculations are compared for the case of shallow cracks in the long wavelength limit. The theoretical results a re also compared with experimental data that have been obtained using a low frequency (454 kHz) electromagnetic-acoustic transducer (EMAT) system. particularly appropriate for detecting and sizing elongated planar defects in butt welds. The scattered It is shown that SH waves may be
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