Crack Propagation in a Linearly Viscoelastic Strip

[+] Author and Article Information
H. K. Mueller

Engineering Technology Laboratory, E. I. du Pont de Nemours & Co., Inc. Wilmington, Del.

W. G. Knauss

Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, Calif.

J. Appl. Mech 38(2), 483-488 (Jun 01, 1971) (6 pages) doi:10.1115/1.3408801 History: Received July 16, 1969; Revised June 01, 1970; Online July 12, 2010


The tip velocity of a crack propagating through a viscoelastic material depends on geometry, applied load and its history, and material properties. A consideration of the work done by the unloading tractions at the crack tip shows that, for a large crack propagating through an infinitely long strip under constant lateral strain, the rate of propagation can be calculated from a knowledge of the intrinsic fracture energy (a material constant), the material creep compliance, and an additional size parameter. This parameter vanishes from the analysis if the material is elastic, and the familiar instability criterion is obtained in this case. Comparison with experimental data is provided and the consequences of step loadings are examined.

Copyright © 1971 by ASME
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