An Investigation of Transient Creep by Means of Endochronic Viscoplasticity and Experiment

[+] Author and Article Information
Han C. Wu

Department of Civil Engineering, The University of Iowa, Iowa City, IA 52242

Chin C. Ho

Aeronautical Research Laboratory, Taichung, Taiwan

J. Eng. Mater. Technol 117(3), 260-268 (Jul 01, 1995) (9 pages) doi:10.1115/1.2804538 History: Received April 20, 1994; Revised October 06, 1994; Online November 27, 2007


Creep of metals has been investigated by means of the endochronic constitutive equation. This is a unified approach. Transient creep tests have been conducted on 304 stainless-steel specimens with carefully monitored precreep loading stage, either loaded at a prescribed constant strain-rate or at a constant stress-rate. It has been found that, for the same hold stress, the creep strain is larger for test with a constant stress-rate preloading than that for a constant strain-rate preloading. This is an effect of plasticity-creep interaction. In all cases, the initial creep strain rate is a continuation of the preloading strain rate. The theory satisfactorily describes the experimental results.

Copyright © 1995 by The American Society of Mechanical Engineers
Topics: Creep
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