About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
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Presentation Title |
Effect of Macrozone Stereology on Crack Growth Rate Predictions in Ti-6Al-4V |
Author(s) |
Jaylen James, Reji John, Sushant Jha, Adam Pilchak, Raymundo Arroyave, Eric J. Payton |
On-Site Speaker (Planned) |
Eric J. Payton |
Abstract Scope |
The fatigue life of near-alpha titanium alloys in service can be reduced by the presence of clusters of alpha phase with similar c-axis orientations, known as micro-textured regions (MTRs) or macrozones. MTRs provide a local
environment that facilitates initiation and growth of sub-surface cracks. Models exist for prediction of fatigue crack growth rate taking into account both dwell time and microtextured region parameters such as size; however, to date only 2-dimensional measurements have been used as inputs to this inherently 3-dimensional problem. In the present work, the MTR regions are assumed to have the shape of prolate spheroids and the major and minor axis lengths are measured in cross-section. Then, the 3D size and shape distributions are estimated using the expectation-maximization and the Cruz-Orive spheroid unfolding algorithm. The magnitude of uncertainty in the unfolding results and implications for fatigue life models for Ti-6Al-4V will be discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Titanium, Modeling and Simulation, Characterization |