Abstract
A broadband incident of longitudinal ultrasonic wave is scattered and mode converted at cracks (of different shapes and sizes) in diffusion bonded titanium. The scattered longitudinal and shear waves are analyzed by an analog spectrum analyzer. The RF signal is also digitized and Fourier analyzed. A geometrical theory of diffraction for elastic waves was developed which is based on (1) Keller's diffraction theory [J. Appl. Phys. 28, 426 (1957)] and (2) Maue' solution to the semi‐infinite plane for elastic waves [Z. fur Angew. Math. u. Mech. 33, 1 (1953)]. The experimentally observed spectra are compared to theoretical calculations. [This research was sponsored by the Center for Advanced NDE operated by the Science Center, Rockwell International, for the Advanced Research Projects Agency and the Air Force Materials Laboratory under Contract F33615‐74‐C‐5180.]
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