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Forest Hardening and Boundary Conditions in 2-D Simulations of Dislocations Dynamics

Published online by Cambridge University Press:  15 February 2011

D. Gómez-García ,
B. Devincre  and
L.P. Kubin
D. Gómez-García
Affiliation:
Laboratoire d'Etude des Microstructures, CNRS-ONERA, BP 72, 92322 Chatillon, France
B. Devincre
Affiliation:
Laboratoire d'Etude des Microstructures, CNRS-ONERA, BP 72, 92322 Chatillon, France
L.P. Kubin
Affiliation:
Laboratoire d'Etude des Microstructures, CNRS-ONERA, BP 72, 92322 Chatillon, France
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Extract

Dislocations are the elementary carriers of plastic flow and are ideally at the base of any physical model for plastic deformation. In the last few years, several 3-D simulations of Dislocation Dynamics (DD) have been devoted to the analysis of single crystal plasticity at small strains [1–5]. However, such DD simulations have some limitations which restrict their domain of application: (i) In many materials, there is a lack of accurate input regarding the mechanisms governed by the core properties of dislocations. (ii) The plastic strain amplitude that can be simulated is usually small (e.g. smaller than 1% in f.c.c. crystals). (iii) The boundary conditions of the simulations are generally rather crude and may introduce spurious size effects and various other artefacts. Most of the time, the questions of stress equilibrium and dislocations flux at the external surfaces are not addressed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 578: Symposia A/C – Multiscale Phenomena in Materials - Experiments in Modeling , 1999 , 131
Copyright
Copyright © Materials Research Society 2000

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References

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