Abstract
It was demonstrated experimentally that a ray-tracing interpretation can be used to quantitatively characterize Y-shaped cracks in stainless steel. A shear wave beam of frequency 2.25 MHz was launched at an angle of 45° in the isotropic stainless steel samples. A series of smooth-sided cracks, in three shapes, progressing from a vertical crack to a Y-shaped one, were machined in the samples. The application of a simplified ray-tracing description led to the identification of the principal ray paths for reflection from key features of these cracks. From the echo arrival time and amplitude data the dimension and position of these crack features could be determined and an outline of the cracks was obtained. In general, the results derived from these echo data compared very well with actual crack measurements.
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