About this Abstract |
Meeting |
2022 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 |
How Do Heterogeneous Dislocation Distributions Determine the Long-range Internal Stress |
Author(s) |
Yejun Gu, Jaafar El-Awady |
On-Site Speaker (Planned) |
Yejun Gu |
Abstract Scope |
We present a new theory for the origins of long-range internal stresses (LRIS) due to heterogeneous dislocation distributions in metals, to understand material fatigues. This theory proposes that the prismatic loop concentration predominantly determines the LRIS. If the hard regions (having high dislocation density) mainly consist of vacancy loops, they are in tension, while the soft regions (having low dislocation densities) are subject to compressive stresses. The opposite is also true. This theory is an extension from the influential composite model by Mughrabi that attributes the LRIS to interfacial geometrically necessary dislocations. Furthermore, this theory has been successfully applied to the cases of dislocation cell structures that formed under different loading conditions in three-dimensional discrete dislocation dynamics simulations.
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Proceedings Inclusion? |
Planned: |