About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Mechanistic Short Crack Growth in Ni Single Crystals: A Study of the Crack Paths and Growth Rates in γ-γ' Microstructure |
Author(s) |
Vasilis Karamitros, Duncan MacLachlan, Fionn Dunne |
On-Site Speaker (Planned) |
Vasilis Karamitros |
Abstract Scope |
Short crack growth (SCG) in single crystal Ni has been studied at temperatures of 25°C and 700°C, reflecting γ' anomalous yield strengthening. CP-XFEM modelling [1] is employed explicitly representing γ-γ' phases in which crack paths are confined to octahedral slip planes with highest slip, and growth rates controlled by critical stored energy density (Gc). At 700°C and low applied stress, crack paths are predicted to be confined within γ channels, since crack tip stored energy density remains highest within the γ phase. With increasing crack length and associated higher crack tip stresses, cracks are predicted to shear through the γ'. Changing the γ' phase Gc allows the systematic analysis of resulting crack paths and rates which are evaluated against experiments [2].
[1] D. Wilson et al. JMPS 124, 827 (2019).
[2] L. Eisenhut et al. IJF 94, 131 (2017). |
Proceedings Inclusion? |
Planned: |
Keywords |
Other, Other, Other |