Recent results obtained by 3D discrete Dislocation Dynamics (DD) simulations are reviewed. Firstly, in the case of fatigued AISI 316L stainless steel, it is shown how DD simulations can both explain the formation of persistent slip bands and give a criterion for crack initiation. The same study is performed in the case of precipitate hardened metals where the precipitate size plays a crucial role. Secondly, we show how molecular dynamics (MD) simulations can feed the DD simulations for two applications. The first concerns the modelling of BCC Fe for which the dislocation mobility is derived from MD simulations. The second considers the modelling of irradiated stainless steels (FCC), where MD is used to define the local rules of interactions between dislocations and Frank loops.
Cet article présente une synthèse des derniers résultats obtenus par simulation de Dynamique des Dislocations. Pour commencer, l'étude du comportement en fatigue de l'acier austénitique 316L montre que les simulations de DD peuvent tout à la fois expliquer la formation des bandes de glissement persistent et prédire un critère physique précisant l'amorçage des premières fissures. Une étude similaire réalisée sur des métaux durcis par précipitation montre le rôle primordiale joué par la taille des particules. Ensuite, il est montré deux applications dans lesquelles des simulations de Dynamique Moléculaire (MD) nourrissent les modèles de DD. La première étude concerne la modélisation du fer BCC pour lequel la mobilité des dislocations est déduite de simulations de MD. La deuxième présente une modélisation de la plasticité d'un acier inoxydable irradié (CFC) pour lequel la MD définit les rêgles locales d'interactions entre dislocations et boucles de Frank.
Mot clés : Dynamique des dislocations, Plasticité
Marc C. Fivel 1
@article{CRPHYS_2008__9_3-4_427_0,
author = {Marc C. Fivel},
title = {Discrete dislocation dynamics: an important recent break-through in the modelling of dislocation collective behaviour},
journal = {Comptes Rendus. Physique},
pages = {427--436},
publisher = {Elsevier},
volume = {9},
number = {3-4},
year = {2008},
doi = {10.1016/j.crhy.2007.11.005},
language = {en},
}
TY - JOUR AU - Marc C. Fivel TI - Discrete dislocation dynamics: an important recent break-through in the modelling of dislocation collective behaviour JO - Comptes Rendus. Physique PY - 2008 SP - 427 EP - 436 VL - 9 IS - 3-4 PB - Elsevier DO - 10.1016/j.crhy.2007.11.005 LA - en ID - CRPHYS_2008__9_3-4_427_0 ER -
Marc C. Fivel. Discrete dislocation dynamics: an important recent break-through in the modelling of dislocation collective behaviour. Comptes Rendus. Physique, Volume 9 (2008) no. 3-4, pp. 427-436. doi : 10.1016/j.crhy.2007.11.005. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2007.11.005/
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