Dislocation dynamics in polycrystalline materials

An extension of the dislocation dynamics method to polycrystalline materials is presented with emphasis on handling interactions between dislocations and grain boundaries. The key new features of the method include: (1) a grain boundary detection algorithm, (2) new dislocation emission criteria base...

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Bibliographic Details
Published in:Modelling and simulation in materials science and engineering 2020-04, Vol.28 (3), p.35009
Main Authors: Cho, Jaehyun, Crone, Joshua C, Arsenlis, Athanasios, Aubry, Sylvie
Format: Article
Language:English
Subjects:
dislocation dynamics
dislocations
emission
ENGINEERING
grain boundaries
MATERIALS SCIENCE
MATHEMATICS AND COMPUTING
ParaDiS
polycrystals
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Summary:An extension of the dislocation dynamics method to polycrystalline materials is presented with emphasis on handling interactions between dislocations and grain boundaries. The key new features of the method include: (1) a grain boundary detection algorithm, (2) new dislocation emission criteria based on power dissipation and area growth, (3) mobility of dislocations at grain boundaries, and (4) extension of topological operations e.g. mesh adaption, collision, and dissociation to handle dislocations interacting with grain boundaries. Furthermore, verification and validation examples are executed to compare our calculations with existing analytic methods, molecular dynamics simulations, and experimental observations.
ISSN:0965-0393
1361-651X
DOI:10.1088/1361-651X/ab6da8