It has long been recognized that the fatigue life of a component can be divided into a crack initiation phase and a crack propagation phase, but researchers have typically ignored one phase or the other in their analytical models. Even in the stress-life method of life prediction, which implicitly includes both phases, no distinction is made between the initiation and propagation phases. In this paper a methodology for generating initiation and propagation S-N curves will be outlined. It will be shown that for components like gears, both phases represent significant portions of total life. It will also be shown that gear bending fatigue lives for variable amplitude load tests are better predicted by a two-stage linear damage theory compared to the commonly used Miner’s total life linear damage theory.
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September 2001
Technical Papers
An Experimental Investigation of Bending Fatigue Initiation and Propagation Lives
Avinash Singh
Avinash Singh
GM Gear Center, GM Powertrain, General Motors Corporation, 30240 Oak Creek Dr., M/C 481-3WX-101, Wixom, MI 48393
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Avinash Singh
GM Gear Center, GM Powertrain, General Motors Corporation, 30240 Oak Creek Dr., M/C 481-3WX-101, Wixom, MI 48393
Contributed by the Stress Analysis & Failure Prev. Committee for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received May 2000. Associate Editor: J. Gao.
J. Mech. Des. Sep 2001, 123(3): 431-435 (5 pages)
Published Online: May 1, 2000
Article history
Received:
May 1, 2000
Citation
Singh, A. (May 1, 2000). "An Experimental Investigation of Bending Fatigue Initiation and Propagation Lives ." ASME. J. Mech. Des. September 2001; 123(3): 431–435. https://doi.org/10.1115/1.1370496
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