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Article

Titre: A multiphase mechanical model for Ti-6Al-4V: Application to the modeling of laser assisted processing
Auteurs: Longuet, A., Robert, Y., Aeby-Gautier, E., Appolaire, B., Mariage, J. F., Colin, C. and Cailletaud, G.
Journal: Computational Material Science
Annee: 2009
Volume: 46
olabel_issue: 3
Pages: 761-766
Organization: Chinese Soc Theoret & Appl Mech
Abstract: A multiphase model for Ti-6Al-4V is proposed. This material is widely used in industrial applications and so needs accurate behaviour modeling. Tests have been performed in the temperature range from 25 degrees C to 1020 degrees C and at strain rates between 10(-3) s(-1) and 1 s(-1). This allowed the identification of a multiphase mechanical model coupled with a metallurgical model. The behaviour of each phase is calibrated by solving an inverse problem including a phase transformation model and a mechanical model to simulate tests under thermomechanical loadings. A scale transition rule (beta-rule) is proposed in order to represent the redistribution of local stresses linked to the heterogeneity of plastic strain. Finally this model is applied to two laser assisted processes: direct laser fabrication and laser welding. (C) 2009 Elsevier B.V. All rights reserved.
Equipe: Département SI2M : Microstructures et Contraintes

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