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Stress Patterns of Deformation Induced Planar Dislocation Boundaries

Published online by Cambridge University Press:  14 March 2011

Shafique M. A. Khan ,
Hussein M. Zbib  and
Darcy A. Hughes
Shafique M. A. Khan
Affiliation:
School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920, USA
Hussein M. Zbib
Affiliation:
School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920, USA
Darcy A. Hughes
Affiliation:
Center for Materials and Engineering Sciences, Sandia National Laboratories, Livermore, CA 94550, USA
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Abstract

A Multi-scale model coupling discrete dislocation dynamics with continuum plasticity and finite element analysis is used to study the self-stress field of geometrically necessary (dislocation) boundaries (GNBs). The results for a single GNB are presented here. The internal structure of the GNB is obtained from the Frank's formula using experimentally measured misorientation angle/axis pair as the input. Several different types of model boundary conditions (using FEA) are analyzed together with the effect of different parameters like the domain length and mesh sensitivity. It is shown that choosing the right boundary conditions for the FEA strongly affects the predicted internal stress fields of these dislocation boundaries, particularly the long-range effect.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 683: Symposium BB – Materials Instabilities and Patterning in Metals , 2001 , BB3.8.1
Copyright
Copyright © Materials Research Society 2001

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References

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