About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
Mission Loading Effects on Small Crack Growth in an Alpha+Beta Titanium Alloy |
Author(s) |
Reji John, Patrick J. Golden, Sushant K. Jha, W. John Porter |
On-Site Speaker (Planned) |
Reji John |
Abstract Scope |
Mechanism-based prediction of the minimum fatigue life requires accurate characterization of the early damage initiation from life-limiting microstructural features and small (microstructure-scale) crack growth. This approach has been used by the Air Force Research Laboratory to predict the limiting fatigue life in aerospace alloys typically under constant amplitude loading conditions. The probabilistic framework requires characterization of the variability of small crack growth emanating from microstructural features as small as 0.010 mm. In addition, component-scale demonstration of this technology requires validation under realistic loading conditions. Hence, this effort will characterize the small crack growth behavior in Ti-6Al-4V under mission loading conditions. Specimens with machined micro-notches (~ 0.010-0.015 mm depth) were used to monitor microstructure-scale crack growth during the variable–amplitude tests simulating mission loading. The presentation will discuss the effect of stress ratio and mission loading on small crack growth and characterization of its variability for probabilistic fatigue life prediction. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |