Fracture Velocity and Fracture Energy of Glass in the Fatigue Range

A method is developed for determining crack velocities from the stress‐time curve of fracture. Velocities of glass broken in air and in vacuum converge at a value between 1 and 10 mm. per second. This convergence is considered to be the upper limit of the fatigue range. Fracture energy has been comp...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1961-01, Vol.44 (1), p.21-26
Main Author: SHAND, ERROL B.
Format: Article
Language:English
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Summary:A method is developed for determining crack velocities from the stress‐time curve of fracture. Velocities of glass broken in air and in vacuum converge at a value between 1 and 10 mm. per second. This convergence is considered to be the upper limit of the fatigue range. Fracture energy has been computed in terms of strain energy release rates. For glass broken in air under low stresses this energy is about equal to the surface energy of the glass, but when in vacuum it is fifteen times greater. At the upper limit of the fatigue range it is thirty times greater, whereas at the terminal velocity of fracture it is of the order of fifty times greater. It is concluded that surface energy must constitute only a small part of the energy absorbed in the fracture process. This excess energy has a pronounced influence on the fracture process and on the measured strength of glass.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1961.tb15341.x