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RESEARCH PAPERS

Constitutive Equation of Cyclic Softening

[+] Author and Article Information
J. S. Mshana

Department of Mechanical Engineering, University of Dar-es-Salaam, Tanzania

A. S. Krausz

Department of Mechanical Engineering, University of Ottawa, Canada

J. Eng. Mater. Technol 107(1), 7-12 (Jan 01, 1985) (6 pages) doi:10.1115/1.3225774 History: Received October 24, 1983; Online September 23, 2009

Abstract

A constitutive equation of cyclic strain softening for materials with low internal stress levels was derived from the rate equation. The study showed that cyclic strain softening is associated with stress relaxation and that the two phenomena are parallel over a high stress and low temperature range where thermally activated plastic flow in the two processes can be approximated with activation over a single energy barrier. The constitutive parameters were identical in both processes, leading to the recommendation that stress relaxation can be employed to determine the experimental variables for the understanding of the cyclic softening process.

Copyright © 1985 by ASME
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