Micromechanical models for ductile failure have been developed in the 1970s and 1980s essentially to address cracking in structural applications and complement the fracture mechanics approach. Later, this approach has become attractive for physical metallurgists interested by the prediction of failure during forming operations and as a guide for the design of more ductile and/or high-toughness microstructures. Nowadays, a realistic treatment of damage evolution in complex metallic microstructures is becoming feasible when sufficiently sophisticated constitutive laws are used within the context of a multilevel modelling strategy. The current understanding and the state of the art models for the nucleation, growth and coalescence of voids are reviewed with a focus on the underlying physics. Considerations are made about the introduction of the different length scales associated with the microstructure and damage process. Two applications of the methodology are then described to illustrate the potential of the current models. The first application concerns the competition between intergranular and transgranular ductile fracture in aluminum alloys involving soft precipitate free zones along the grain boundaries. The second application concerns the modeling of ductile failure in friction stir welded joints, a problem which also involves soft and hard zones, albeit at a larger scale.
Les modèles micromécaniques pour la rupture ductile ont été développés essentiellement au cours des années 1970 et 1980 avec comme but de traiter des problèmes de rupture dans des applications structurales et de compléter l'approche par la mécanique de la rupture. Plus tard, cette approche micromécanique a attiré les spécialistes de la métallurgie physique soucieux de prédire les problèmes de rupture pendant les opérations de mise en forme ainsi que d'être guidés pour l'élaboration de microstructures plus ductiles et/ou plus tenaces. Aujourd'hui, il est devenu possible d'aborder de façon réaliste l'évolution du dommage dans des microstructures métalliques complexes à condition d'utiliser des lois constitutives suffisamment sophistiquées dans le contexte d'une stratégie de modélisation multi-échelle. La compréhension actuelle et l'état de l'art dans la modélisation des phénomènes de germination, croissance et coalescence de cavités sont passés en revue en portant une attention particulière à la physique sous-jacente. La prise en compte des différentes longueurs caractéristiques associées à la microstructure et au processus d'endommagement est discutée. Deux applications de la méthodologie sont décrites pour illustrer le potentiel des modèles. La première application concerne la compétition entre rupture ductile intergranulaire et transgranulaire dans des alliages d'aluminium impliquant des zones molles sans précipité le long des joints de grain. La seconde application concerne la modélisation de la rupture ductile de joints soudés par friction malaxage, un problème qui implique également des zones dures et molles, mais à une échelle plus grande.
Mots-clés : Rupture ductile, Modélisation multiéchelle, Ductilité, Ténacité, Endommagement, Cavités
Thomas Pardoen 1; Florence Scheyvaerts 1; Aude Simar 1; Cihan Tekoğlu 1; Patrick R. Onck 2
@article{CRPHYS_2010__11_3-4_326_0,
author = {Thomas Pardoen and Florence Scheyvaerts and Aude Simar and Cihan Teko\u{g}lu and Patrick R. Onck},
title = {Multiscale modeling of ductile failure in metallic alloys},
journal = {Comptes Rendus. Physique},
pages = {326--345},
publisher = {Elsevier},
volume = {11},
number = {3-4},
year = {2010},
doi = {10.1016/j.crhy.2010.07.012},
language = {en},
}
TY - JOUR AU - Thomas Pardoen AU - Florence Scheyvaerts AU - Aude Simar AU - Cihan Tekoğlu AU - Patrick R. Onck TI - Multiscale modeling of ductile failure in metallic alloys JO - Comptes Rendus. Physique PY - 2010 SP - 326 EP - 345 VL - 11 IS - 3-4 PB - Elsevier DO - 10.1016/j.crhy.2010.07.012 LA - en ID - CRPHYS_2010__11_3-4_326_0 ER -
%0 Journal Article %A Thomas Pardoen %A Florence Scheyvaerts %A Aude Simar %A Cihan Tekoğlu %A Patrick R. Onck %T Multiscale modeling of ductile failure in metallic alloys %J Comptes Rendus. Physique %D 2010 %P 326-345 %V 11 %N 3-4 %I Elsevier %R 10.1016/j.crhy.2010.07.012 %G en %F CRPHYS_2010__11_3-4_326_0
Thomas Pardoen; Florence Scheyvaerts; Aude Simar; Cihan Tekoğlu; Patrick R. Onck. Multiscale modeling of ductile failure in metallic alloys. Comptes Rendus. Physique, Computational metallurgy and scale transitions, Volume 11 (2010) no. 3-4, pp. 326-345. doi : 10.1016/j.crhy.2010.07.012. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2010.07.012/
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