Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; January 1963; v. 53; no. 1; p. 87-93
© 1963 Seismological Society of America
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Measurements of the velocity of crack propagation in glass plates

JOHN DENOYER and HENRY POLLACK

DEPARTMENT OF GEOLOGY AND MINERALOGY THE UNIVERSITY OF MICHIGAN, ANN ARBOR, MICHIGAN

Abstract

The velocity of crack propagation in glass plates has been measured. The plates were strained until fractures were initiated. Measurements made over various small segments of the crack path show variations in crack velocity from 0.01 to about 4 km/sec. The velocity of propagation appears to be related to the strain-energy distribution. Regions of the plate where the strain energy was high prior to fracture yielded the highest crack velocities.






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