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Linking micro- and macroscopic aspects of a dislocation based continuum model by investigating the dislocation double pileup

By S. Schmitt, K. Schulz, D. Dickel and P. Gumbsch

Abstract

In this contribution we discuss the problem of a dislocation double pileup at impenetrable boundaries which serves as a benchmark test to examine the continuum dislocation dynamics (CDD). We enhance a formulation for a numerical implementation and the mean-field theory to account for the long-range stress field due to inhomogeneous plastic deformations by a suitable correction term. This allows us to handle the motion of dislocation densities at impenetrable boundaries and study the influence of dislocation interactions on a scale much smaller than the scale of the proposed mean-field stress

Topics: dislocation, continuum model, dislocation pileup, plasticity, plastic deformation
Year: 2013
DOI identifier: 10.1002/pamm.201310132
OAI identifier: oai:fraunhofer.de:N-287306
Provided by: Fraunhofer-ePrints
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