Microstructural comparison of the kinematics of discrete and continuum dislocations models

被引：28

作者：

Sandfeld, Stefan ^{[1
]}

Po, Giacomo ^{[2
]}

机构：

[1] Univ Erlangen Nurnberg, Inst Mat Simulat, D-90762 Furth, Germany

[2] Univ Calif Los Angeles, Dept Mech & Aerosp Engn, Los Angeles, CA 90095 USA

来源：

MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING | 2015年 / 23卷 / 08期

关键词：

dislocation dynamics; continuum theory of dislocations; microstructure; coarse graining; NUMERICAL IMPLEMENTATION; DYNAMICS; PLASTICITY; DISTRIBUTIONS; EVOLUTION; TRANSPORT; DENSITY; FIELDS;

D O I：

10.1088/0965-0393/23/8/085003

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Continuum Dislocation Dynamics (CDD) theory and the Discrete Dislocation Dynamics (DDD) method are compared based on concise mathematical formulations of the coarse graining of discrete data. A numerical tool for converting from a discrete to a continuum representation of a given dislocation configuration is developed, which allows to directly compare both simulation approaches based on continuum quantities (e.g. scalar density, geometrically necessary densities, mean curvature). Investigating the evolution of selected dislocation configurations within analytically given velocity fields for both DDD and CDD reveals that CDD contains a surprising number of important microstructural details.

引用

页数：27

共 57 条

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