Abstract
This paper describes the use of Rayleigh waves as observed with the reflected-light method of caustics to obtain information pertaining to crack speed and tip location. The basic idea is to use the Doppler-shift effect as applied to elastic-wave emission from a running crack to geometrically reconstruct crack-tip locations. In addition to the usual information pertaining to the stress-intensity factor at the time when the photograph was taken, the process yields a complete history of crack-propagation velocities even along curved-crack paths.
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