About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Deformation and Damage Mechanisms of High Temperature Alloys
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Presentation Title |
Microstructurally-sensitive Fatigue Crack Nucleation and Growth in Nickel Single Crystals |
Author(s) |
Vassilios Karamitros, Duncan Maclachlan, Fionn Patrick Dunne |
On-Site Speaker (Planned) |
Fionn Patrick Dunne |
Abstract Scope |
This paper explores the mechanistic basis of crack nucleation and growth in single crystal nickel alloy under fatigue loading. Crack paths are hypothesised to be crystallographic and controlled by maximum crystal planar slip, with rate of growth determined by local crack tip stored energy density [1]. Crystal plasticity modelling is developed to replicate experimental single-crystal edge-cracked samples with multiple crystal orientations and to test the mechanistic basis of tortuous crack paths and growth rates obtained from experiment. The characteristics of the independent experiments are captured by the mechanistic model, including path tortuosity, with unique critical stored energy density of 385 Jm-2. Critical appraisal of the model results in the context of other experimental observations will also be presented.
[1] Wilson, D., et al. J. Mech. Phys. Solids https://doi.org/10.1016/j.jmps.2019.02.012
[2] Sakaguchi, M., et al. Int. J. Fatigue https://doi.org/10.1016/j.ijfatigue.2019.02.003 |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Modeling and Simulation, Mechanical Properties |