Abstract
Using a Beckman & Whitley high-speed framing camera, the velocity of glass fracture caused by an underwater disruptive electric spark was measured. The observed maximum velocity was about 2.4 km/sec, 60% higher than the usually accepted normal limiting value. A gradual decrease of fracture velocity was also observed. From these observations it has been deduced that the maximum fracture velocity is, contrary to the hitherto assumed theory, dependent on the increasing rate of applied stress.
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