Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 120, Issue -, Pages 248-261Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2019.05.003
Keywords
dislocations; grain boundaries; crystal plasticity; finite elements; Discontinuous galerkin method
Funding
- German Research Foundation (DFG)
- European Social Fund
- state of Baden-Wurttemberg
- Ministry of Science, Research and the Arts Baden-Wurttemberg
- Federal Ministry of Education and Research
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We consider a mesoscale continuum model for the evolution of dislocation density in small-strain crystal plasticity. The model is based on the continuum dislocation dynamics theory and extended by a formulation for impenetrable grain boundaries. We introduce a fully coupled numerical method combining a conforming finite element approximation of elasto-plasticity with an implicit Runge-Kutta discontinuous Galerkin discretization of the dislocation microstructure which allows for 3d computations including multiple slip systems and dislocation interaction. In addition, a numerical representation of grain boundaries impenetrable to dislocation flux is considered within this framework. The formulation is applied to a tricrystal focusing on the analysis of dislocation stress interaction between different grains. The results are compared to discrete dislocation dynamics data from the literature.
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