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Comparison of mechanical behaviour of thin film simulated by discrete dislocation dynamics and continuum crystal plasticity

journal contribution
posted on 2009-05-01, 00:00 authored by F Šiška, D Weygand, S Forest, P Gumbsch
3D finite element simulations of 9-grain multicrystalline aggregates are performed within the framework of the classical continuum crystal plasticity and discrete dislocation dynamics. The results are processed in a statistical way by ensemble averaging. The comparison is made at three levels: macroscopic stress–strain curves, average stress values per grain, local values of stress and plastic strain. The comparison shows that some similarities are observed in the stress and strain distributions in both simulations approaches. But there are also large discrepancies caused by the discrete nature of plasticity in DDD. The DDD simulations provide higher stress levels in the aggregate due to the small number of dislocation sources and to the stress field induced by individual dislocations.

History

Journal

Computational materials science

Volume

45

Issue

3

Pagination

793 - 799

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0927-0256

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2008, Elsevier B.V.

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