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On the mechanistic difference between in-phase and out-of-phase thermo-mechanical fatigue crack growth
,
B. Grant
International Journal of Fatigue, Volume: 135, Start page: 105528
Swansea University Author:
Mark Whittaker
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DOI (Published version): 10.1016/j.ijfatigue.2020.105528
Abstract
The crack driving mechanisms in a coarse grained nickel-base superalloy RR1000 when subjected to in- and out of phase thermo mechanical fatigue are investigated. It is found that the difference in fatigue crack growth rate between these two load conditions is accounted for by the different mechanica...
| Published in: | International Journal of Fatigue |
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| ISSN: | 0142-1123 |
| Published: |
Elsevier BV
2020
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa53515 |
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| Abstract: |
The crack driving mechanisms in a coarse grained nickel-base superalloy RR1000 when subjected to in- and out of phase thermo mechanical fatigue are investigated. It is found that the difference in fatigue crack growth rate between these two load conditions is accounted for by the different mechanical conditions at the crack tip region, rather than oxidation effects. This is based on digital image correlation and finite element analyses of the mechanical strain field at the crack tip, which demonstrate that in phase leads to larger crack tip deformation and crack opening. Notably, it is demonstrated that in- and out of phase crack growth rates coincide when correlated to the crack tip opening displacement. |
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| Keywords: |
Aerospace; Superalloys; Thermomechanical fatigue; Crack growth rate; Crack opening |
| College: |
Faculty of Science and Engineering |
| Start Page: |
105528 |