Multiaxial Fatigue Under Variable Amplitude Loads

[+] Author and Article Information
K. S. Kim, J. C. Park, J. W. Lee

Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, Korea 790-784

J. Eng. Mater. Technol 121(3), 286-293 (Jul 01, 1999) (8 pages) doi:10.1115/1.2812377 History: Received September 22, 1997; Revised June 23, 1998; Online November 27, 2007


Multiaxial fatigue under variable amplitude loading is investigated using Kandil et al.’s parameter, rainflow cycle counting on the shear strain history, and the Miner-Palmgren damage rule. Fatigue data are obtained on tubular specimens of S45C steel under proportional and nonproportional tension-torsion loading. The approaches using the maximum shear strain range (Δγmax ) plane and the maximum damage (Dmax ) plane as the critical plane are investigated. The damage is computed for each reversal or for each cycle. The results show that both Δγmax and Dmax approaches yield acceptable fatigue lives irrespective of the damage computation method. Damage computation for each reversal tends to shift fatigue life toward the nonconservative side for some nonproportional loading. It is concluded that the overall procedure used in this study is viable for multiaxial life prediction under variable amplitude loading for the test material.

Copyright © 1999 by The American Society of Mechanical Engineers
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