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[1] We examine the local nature of the dynamic stress field in the vicinity of the tip of a semi-infinite sub-Rayleigh (slower than the Rayleigh wave speed, c R) mode II crack with a velocity-weakening cohesive zone. We constrain the model using results from dynamic photoelastic experiments, in which shear ruptures were nucleated spontaneously in(More)
Windrock in 1991 and has worked on several R&D projects as both a Design Engineer and Software Developer. Mr. Griffith's last five years have been devoted to development of software for both portable and online equipment used in analyzing the health and performance of reciprocating machinery. His work experience prior to Windrock mainly consisted of data(More)
Characterizing the interaction between fluids and microscopic defects is one of the long-standing challenges in understanding a broad range of cracking processes, in part because they are so difficult to study experimentally. We address this issue by reexamining records of emitted acoustic phonon events during rock mechanics experiments under wet and dry(More)
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