Application of an Internal Variable Constitutive Model to Predict Creep Response of an Aluminum Alloy Under Multiaxial Loading

[+] Author and Article Information
I. U. Mahmood

The University of Oklahoma, Norman, Ok. 73019

M. O. Faruque

University of Petroleum and Minerals, Dahran, Saudi Arabia

M. M. Zaman

School of Civil Engineering and Environmental Science, The University of Oklahoma, Norman, Ok. 73019

J. Appl. Mech 56(3), 514-518 (Sep 01, 1989) (5 pages) doi:10.1115/1.3176120 History: Received April 05, 1988; Revised September 07, 1988; Online July 21, 2009


This paper discusses the application of an internal variable, creep constitutive model, where the concept of piecewise linearity in the effective stress-creep strain rate relationship is utilized. Since the concept of piecewise linearity is assumed, an explicit functional form for creep strain rate at all levels of stress and temperature is not required. The aforementioned constitutive model is used to predict the creep response of an aluminum alloy (2618-T61) at 200°C and subjected to multiaxial loading. The results are compared with available experimental results. The model shows excellent agreement in the trend of creep response. The quantitative values also agree quite good with the experimental results.

Copyright © 1989 by ASME
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