Abstract
Scattering of Rayleigh surface waves by a surface crack is numerically analyzed using the finite difference method and the FFT algorithm. For small cracks, the reflection coefficient increases and the transmission coefficient decreases with the depth/wavelength ratio, while the transit time of transmitted signal linearly increases with the ratio. The numerical solutions are in good agreement with the experimental observations by ultrasonic spectrum analysis and the transit time measurements for artificial cracks in mild-steel specimens.
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