|About this Abstract
||Materials Science & Technology 2011
||Fatigue and Microstructure: A Symposium on Recent Advances
||Probabilistic Prediction of Minimum Fatigue Life of a Shot Peened Titanium Alloy
||Reji John, Sushant K Jha, James M Larsen
|On-Site Speaker (Planned)
The benefits of shot-peen induced compressive residual stresses in improving fatigue life and retardation of crack growth have been extensively demonstrated. Incorporating surface-treatment induced residual stresses (RS) in life prediction has been hampered by the variability in the RS profile and relaxation, and a lack of physics-based measure of the benefit of RS on the lifetime. Hence, the fatigue variability behavior of the alpha+beta titanium alloy, Ti-6Al-2Sn-4Zr-6Mo, was studied at 260°C under RS-free, low stress ground and shot-peen surface conditions. The variability in the RS profile for the low stress ground and shot-peen conditions was determined. The influence of the surface treatment effects on the variability in the location and size of the failure initiation sites was characterized. This distribution of initiation sizes was coupled with the variability in micro-scale small crack growth and RS depth profiles to probabilistically predict the observed fatigue lifetime limit in Ti-6Al-2Sn-4Zr-6Mo.
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