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RESEARCH PAPERS

Time Dependent Fracture and Cohesive Zones

[+] Author and Article Information
W. G. Knauss

Graduate Aeronautics Laboratories, California Institute of Technology, Pasadena, CA

J. Eng. Mater. Technol 115(3), 262-267 (Jul 01, 1993) (6 pages) doi:10.1115/1.2904216 History: Received May 10, 1992; Revised July 28, 1992; Online April 29, 2008

Abstract

This presentation is concerned with the fracture response of materials which develop cohesive or bridging zones at crack tips. Of special interest are concerns regarding crack stability as a function of the law which governs the interrelation between the displacement(s) or strain across these zones and the corresponding holding tractions. It is found that for some materials unstable crack growth can occur, even before the crack tip has experienced a critical COD or strain across the crack, while for others a critical COD will guarantee the onset of fracture. Also shown are results for a rate dependent nonlinear material model for the region inside of a craze for exploring time dependent crack propagation of rate sensitive materials.

Copyright © 1993 by The American Society of Mechanical Engineers
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