Issue |
Mécanique & Industries
Volume 12, Number 3, 2011
CFM 2011
|
|
---|---|---|
Page(s) | 193 - 198 | |
DOI | https://doi.org/10.1051/meca/2011107 | |
Published online | 20 July 2011 |
Loi de comportement en plasticité cristalline pour acier à basse température
Crytalline plasticity constitutive equations for BCC steel at low temperature
1
EDF R&D, MMC, Avenue des Renardières, Écuelles,
77818
Moret-sur-Loing Cedex,
France
2
CEA Saclay, DEN, SRMA, 91191
Gif-sur-Yvette Cedex,
France
a Auteur pour correspondance :
ludovic.vincent@cea.fr
Reçu :
28
Avril
2011
Accepté :
11
Mai
2011
Dans le cadre de la prévision par une approche multiéchelles de l’évolution de la courbe de transition ductile/fragile des aciers de cuves des centrales nucléaires en fonction de l’irradiation, on commence par tenter de reproduire le comportement mécanique à basse température de ces matériaux à l’échelle de l’agrégat. Partant d’une analyse des résultats numériques obtenus par dynamique des dislocations discrètes dans ce régime de température, une nouvelle loi de comportement en plasticité cristalline est donc proposée avec un minimum de paramètres ajustables sur résultats macroscopiques.
Abstract
The prediction of the irradiation-induced evolution of the ductile-fragile transition curve of pressure vessel steels is a major research topic in the nuclear industry. Multiscale approaches starting from ab initio scale up to macroscopic continuum mechanics are currently investigated through the European project PERFORM60. At the intermediate level of cristal plasticity, several effects need to be described accurately before considering the introduction of irradiation hardening mechanisms, such as the thermal activity of dislocations slip, the different mobilities between screw and edge dislocations at low temperature. These effects should be introduced in a cristal plasticity law used in finite-element simulations of polycrystalline aggregates. Accordingly, a new cristal plasticity law is proposed in this paper based on a critical analysis of previous numerical results obtained with a discrete dislocations dynamics code.
Mots clés : Plasticité cristalline / dislocations / matériaux cubiques centrés / activation thermique
Key words: Cristal plasticity / dislocations / body-centered cubic materials / thermal activity
© AFM, EDP Sciences 2011
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