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Multiscale modelling of hardening in BCC crystal plasticity

Stainier, L. and Cuitino, A. M. and Ortiz, M. (2003) Multiscale modelling of hardening in BCC crystal plasticity. Journal de Physique IV (Proceedings), 105 . pp. 157-164. ISSN 1155-4339. http://resolver.caltech.edu/CaltechAUTHORS:20171128-115759473

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Abstract

The mechanical behavior of polycrystalline metals can be successfully modeled by macroscopic theories, such as Von Mises plasticity. On the other hand, numerous studies can be performed on the atomic scale, either by atomistic or dislocation dynamics models. The proposed model attempts to bridge those two scales by deriving constitutive relations between slip strains, dislocation densities and resolved shear stresses on crystallographic planes, from mechanisms of deformation playing at the level of the dislocation line. The resulting "mesoscopic" hardening relations are controlled by dislocation self energies and junctions strengths. Temperature and strain rate dependence result from the presence of thermally activated mechanisms such as Peierls barriers or pair annihilation by cross slip. A set of material parameters is identified for Tantalum by fitting the numerical stress strain curves from these tests with experimental results gathered in the literature. These parameters prove to be in very good agreement with the values which can be derived from molecular dynamics computations.


Item Type:Article
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https://doi.org/10.1051/jp4:20030183PublisherArticle
https://jp4.journaldephysique.org/en/articles/jp4/abs/2003/03/jp4pr3p157/jp4pr3p157.htmlPublisherArticle
Additional Information:© EDP Sciences 2003. The support of the DOE through Caltech's ASCI Center for the Simulation of the Dynamic Response of Materials is gratefully acknowledged. LS also wishes to acknowledge support from the Belgian National Fund for Scientific Research (FNRS).
Group:GALCIT
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Department of Energy (DOE)UNSPECIFIED
Fonds de la Recherche Scientifique (FNRS)UNSPECIFIED
Record Number:CaltechAUTHORS:20171128-115759473
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20171128-115759473
Official Citation:Multiscale modelling of hardening in BCC crystal plasticity L. Stainier, A.M. Cuitino et M. Ortiz J. Phys. IV France, 105 (2003) 157-164 DOI: https://doi.org/10.1051/jp4:20030183
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83532
Collection:CaltechAUTHORS
Deposited By: Lydia Suarez
Deposited On:28 Nov 2017 21:18
Last Modified:15 Dec 2017 19:49

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