[Comportement viscoplastique des aciers en cours de transformation de phase]
La contribution à la plasticité de transformation des aciers due au mécanisme dit de Greenwood–Johnson est souvent décrite à l'aide du modèle de Leblond et coll. Ce modèle faisait l'hypothèse d'un comportement purement plastique. On l'étend ici en incorporant les effets visqueux, présents lors de certaines transformations, particulièrement à haute température. Les prédictions des modèles original et étendu sont comparées à des résultats expérimentaux pour un matériau pour lequel la seconde contribution à la plasticité de transformation, due au mécanisme dit de Magee, est connue pour être négligeable, et l'on montre que l'incorporation des effets visqueux dans le modèle en améliore significativement les prédictions.
That contribution to transformation plasticity of steels arising from the so-called Greenwood–Johnson mechanism is often described using the model developed by Leblond and coworkers. This model made the assumption of purely plastic behaviour. It is extended here to incorporate viscous effects, which are present during some transformations, especially at high temperatures. The predictions of the original and extended models are compared to experimental results for a material for which the second contribution to transformation plasticity, due to the so-called Magee mechanism, is known to be negligible, and it is shown that the incorporation of viscous effects into the model significantly improves its predictions.
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Mots-clés : Solides et structures, Plasticité de transformation, Viscoplasticité, Mécanisme de Greenwood–Johnson, Modélisation, Essai Satoh
Yannick Vincent 1 ; Jean-Michel Bergheau 2 ; Jean-Baptiste Leblond 3
@article{CRMECA_2003__331_9_587_0,
author = {Yannick Vincent and Jean-Michel Bergheau and Jean-Baptiste Leblond},
title = {Viscoplastic behaviour of steels during phase transformations},
journal = {Comptes Rendus. M\'ecanique},
pages = {587--594},
publisher = {Elsevier},
volume = {331},
number = {9},
year = {2003},
doi = {10.1016/S1631-0721(03)00147-5},
language = {en},
}
TY - JOUR AU - Yannick Vincent AU - Jean-Michel Bergheau AU - Jean-Baptiste Leblond TI - Viscoplastic behaviour of steels during phase transformations JO - Comptes Rendus. Mécanique PY - 2003 SP - 587 EP - 594 VL - 331 IS - 9 PB - Elsevier DO - 10.1016/S1631-0721(03)00147-5 LA - en ID - CRMECA_2003__331_9_587_0 ER -
Yannick Vincent; Jean-Michel Bergheau; Jean-Baptiste Leblond. Viscoplastic behaviour of steels during phase transformations. Comptes Rendus. Mécanique, Volume 331 (2003) no. 9, pp. 587-594. doi : 10.1016/S1631-0721(03)00147-5. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/S1631-0721(03)00147-5/
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