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Crysal Plasticity Finite Element Simulations based on Continuum Dislocation Dynamics
Author(s) -
Ebrahimi Alireza,
Hochrainer Thomas
Publication year - 2016
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201610151
Subject(s) - dislocation , plasticity , dislocation creep , materials science , crystal plasticity , shear (geology) , critical resolved shear stress , mechanics , constitutive equation , peierls stress , finite element method , classical mechanics , physics , composite material , thermodynamics , shear rate , viscosity
Plastic deformation of crystalline materials is the result of the motion and interaction of dislocations. Continuum dislocation dynamics (CDD) defines flux‐type evolution equations of dislocation variables which can capture the kinematics of moving curved dislocations. Coupled with Orowan's law, which connects the plastic shear rate to the dislocation flux, CDD defines a dislocation density based material law for crystal plasticity. In the current work we provide simulations of a micro‐bending experiment of a single crystal and compare the results qualitatively to those from discrete dislocation simulations from the literature. We show that CDD reproduces salient features from discrete dislocation simulations regarding the stress distribution, the dislocation density and the accumulated plastic shear, which would be hard to obtain from more traditional crystal plasticity constitutive laws. © 2016 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)