The role of competing mechanisms in the fatigue-life variability of a titanium and gamma-TiAl alloy |
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Authors: | S K Jha J M Larsen A H Rosenberger |
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Affiliation: | (1) Universal Technology Corporation, Dayton, Ohio;(2) the Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio |
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Abstract: | The variability in fatigue lives of an α+β titanium alloy (Ti-6Al-2Sn-4Zr-6Mo) and a γ-TiAl-based alloy in stress vs. life
space resulted from superposition of variability associated with two separate mechanisms. The mean lives of the two mechanisms
diverged with decreasing stress level, giving rise to the variability. A life-prediction methodology based on the variability
in the worst-case mechanism is suggested. The potential for reducing uncertainty and increasing the utilization of the useful
life as compared to more traditional approaches is discussed.
For more information, contact S.K. Jha, Universal Technology Corporation, 1270 N Fairfield Road, Dayton, OH 45432; (937) 255-0388;
fax (937) 656-4840; e-mail sushantjha@hotmail.com |
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