Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 18, Issue 9, Pages 1133-1163Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0749-6419(01)00044-4
Keywords
dislocations, dynamics; elastic-viscoplastic materials
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A framework for investigating size-dependent small-scale plasticity phenomena and related material instabilities at various length scales ranging from the nano-microscale to the meso-scale is presented. The model is based on fundamental physical laws that govern dislocation motion and their interaction with various defects and interfaces. Particularly, the multi-scale framework merges two scales, the nano-microscale where plasticity is determined by explicit three-dimensional dislocation dynamics analysis providing the material length-scale, and the continuum scale where energy transport is based on basic continuum mechanics laws. The result is a hybrid elasto-viscoplastic simulation model coupling discrete dislocation dynamics with finite element analyses. With this hybrid approach, one can address complex size-dependent problems including, dislocation boundaries, dislocations in heterogeneous structures, dislocation interaction with interfaces and associated shape changes and lattice rotations, as well as deformation in nano-structured materials, localized deformation and shear bands. (C) 2002 Elsevier Science Ltd. All rights reserved.
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