About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
Advances in Modeling of Fatigue Thresholds |
Author(s) |
Huseyin Sehitoglu |
On-Site Speaker (Planned) |
Huseyin Sehitoglu |
Abstract Scope |
The fatigue thresholds have been a topic of extensive research over the years mainly from the experimental viewpoint. From the theoretical side, there has been only handful of investigations. It is well known that the microstructure affects the fatigue crack growth thresholds. In many cases, the fatigue threshold is not unique and depends on the crack tip environment, ie. the presence of twins, their distance with respect to the crack tip, different grain boundary types and the local friction stress (resistance to flow) as influenced by the interfaces. We devise an atomistic-continuum model for determining the irreversibility of displacements at crack tips, hence fatigue crack growth rates, in metallic alloys. We show examples of our calculations for specific metals and explain the experimental results in the literature including our own work showing the role of microstructure on fatigue threshold behavior. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |