On the Nature of Moving Cracks

[+] Author and Article Information
B. Cotterell

Department of Mechanical Engineering, University of Sydney, Sydney, New South Wales, Australia

J. Appl. Mech 31(1), 12-16 (Mar 01, 1964) (5 pages) doi:10.1115/1.3629533 History: Received January 14, 1963; Online September 15, 2011


It is shown that the dynamic elastic-wave equations can be integrated quite simply in the neighborhood of the tip of a moving crack. A simple approximation to the exact solution is given. From examination of the dynamic stress field, arguments are presented to explain the increase in fracture toughness and fracture surface roughness with crack velocity. It is also postulated that fracture paths, asymmetrical to the applied loading, can be stable if their velocity of crack propagation is great enough.

Copyright © 1964 by ASME
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