About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
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Presentation Title |
Mesoscale Model for Stress Field Evolution at Grain Boundaries Motivated by Atomistic Simulations of Dislocation-Grain Boundary Interactions |
Author(s) |
Darshan Bamney, Royce Reyes, Laurent Capolungo, Douglas E. Spearot |
On-Site Speaker (Planned) |
Douglas E. Spearot |
Abstract Scope |
Discrete dislocation dynamics (DDD) is a mesoscale modeling technique that simulates the dynamics and interactions of dislocations. Unfortunately, the utility of DDD simulations for problems that involve grain boundaries (GBs) is compromised by missing defect physics. The objective of this work is to use molecular dynamics (MD) simulations to study the interaction between an expanding dislocation loop and a grain boundary. The GBs chosen have stress fields that can be captured via an array of wedge disclination dipoles. Interaction details are examined via a new implementation of the atomic Nye Tensor, revealing that absorbed dislocation content is deposited along the wedge disclination dipoles. Motivated by these MD results, a mesoscale model for the evolution of a GB stress field due to dislocation – grain boundary interactions is developed. DDD simulations reveal that accumulated dislocation content from prior slip transmission lowers the external driving stresses required for subsequent slip transmission. |
Proceedings Inclusion? |
Planned: |