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Distribution of dislocation density and residual stresses in plastically deformed specimens: numerical studies
Author(s) -
Shutov A. V.,
Silbermann C.,
Ihlemann J.
Publication year - 2014
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201410155
Subject(s) - dislocation , materials science , viscoplasticity , plasticity , anisotropy , finite element method , phenomenological model , hardening (computing) , coupling (piping) , dislocation creep , mechanics , strain hardening exponent , composite material , condensed matter physics , structural engineering , constitutive equation , physics , engineering , layer (electronics) , quantum mechanics
A two‐scale approach to the simulation of mechanical properties of metallic materials is considered. On the macroscopic level, the material behavior is described by a phenomenological model of finite strain viscoplasticity with nonlinear kinematic hardening. In particular, the process‐induced plastic anisotropy is captured by backstresses. On the microstructural level, the so called “load path sensitive two‐population dislocation cell model” is implemented. It describes an evolving dislocation cell structure with dislocation populations for dislocation cell walls and the cell interior. Owing to the coupling with the phenomenological plasticity model, it can describe the evolution of the dislocation densities depending on the load path. The applicability of the multiscale approach to the FEM simulation of severe plastic deformation processes such as Equal Channel Angular Pressing is demonstrated. (© 2014 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)