A General Fatigue Theory and Its Application to Out-of-Phase Cyclic Loading

[+] Author and Article Information
F. Ellyin, Z. Xia

Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G8

J. Eng. Mater. Technol 115(4), 411-416 (Oct 01, 1993) (6 pages) doi:10.1115/1.2904239 History: Received October 09, 1992; Online April 29, 2008


Results of an experimental investigation of a constant-amplitude, fully reversed biaxial tension-compression out-of-phase cyclic loading are presented first. An energy-based fatigue theory is extended to include nonproportional (out-of-phase) cyclic loading. Finally, a constitutive model is presented to predict the cyclic multiaxial stress-strain response, and to calculate the energy based damage parameter. Thus, a general theory, applicable to uniaxial, proportional, and nonproportional multiaxial cyclic fatigue is presented. The predicted results are in fairly good agreement with the constant amplitude test data. A few uniaxial fatigue tests and an out-of-phase cyclic test are required to specify material constants of the theory.

Copyright © 1993 by The American Society of Mechanical Engineers
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