About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Microstructure-Sensitive Modeling Across Length Scales: An MPMD/SMD Symposium in Honor of David L. McDowell
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| Presentation Title |
Dislocation - Grain Boundary Interactions Modeled at Atomistic and Mesoscopic Length Scales |
| Author(s) |
Douglas E. Spearot |
| On-Site Speaker (Planned) |
Douglas E. Spearot |
| Abstract Scope |
Plastic deformation in metallic materials is governed by the individual and collective behaviors of dislocations, including their interaction with the microstructure. Among computational methods for simulating this inherently multiscale problem, discrete dislocation dynamics (DDD) is a powerful technique. Yet, the utility of DDD simulations for problems that involve grain boundaries (GBs) is compromised by missing defect physics. This talk first will present a brief history of the use of molecular dynamics (MD) simulations to study the interaction between dislocations and grain boundaries. Then, new MD results showing the interaction of a dislocation loop and a GB are presented, with details examined via an implementation of the atomic Nye Tensor. Motivated by MD, a model for the evolution of a GB stress field due to dislocation – grain boundary interactions is presented. DDD simulations reveal that prior slip transmissions lower the external driving stress required for subsequent slip transmission. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Mechanical Properties, Computational Materials Science & Engineering |