About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Exploring Effects of Cold-dwell Fatigue on the Growth of Long Cracks in Alpha+Beta Ti-6Al-4V |
Author(s) |
James M. Larsen, Andrew H. Rosenberger, Adam L. Pilchak, N. Eugene Young, Phillip Sherer, Patrick Golden, Reji John |
On-Site Speaker (Planned) |
James M. Larsen |
Abstract Scope |
The mechanisms of dwell fatigue of a propagating crack in forged Ti-6Al-4V were studied using conventional compact tension specimens tested under a wide range of dwell fatigue conditions. Given the long time needed to perform dwell fatigue experiments over a useful range of ΔK, this project used a Kmax-constant-controlled block-loading approach, which permitted precise measurement of da/dN-ΔK over a broad range of test conditions, including variables of Kmax, force ratio (R), hold time, frequency, and loading sequence. The crack growth results exhibited a well-defined transition in crack growth rate, with a high Paris slope observed in the range of Kmax ~ 12-19 MPa*m1/2, and lower, nearly identical Paris slopes before and after the transition. Using a 3-section Paris regression of the Kmax-controlled data, the variability in the actual/correlated values of the fit vs. data in terms of (1/1000 percentile)/(1/2 percentile) was approximately 2.0. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Modeling and Simulation, Titanium |