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Titre: A multiphase mechanical model for Ti-6Al-4V: Application to the modeling of laser assisted processing
Auteur(s): A. Longuet, Y. Robert, E. Aeby-Gautier, B. Appolaire, J. F. Mariage, C. Colin et G. Cailletaud
Journal: Computational Material Science
Année: 2009
Volume: 46
Issue: 3
Pages: 761-766
Organisation: Chinese Soc Theoret & Appl Mech
DOI: 10.1016/j.commatsci.2009.05.012
ISSN: 0927-0256
Résumé: 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.
Projet: Département SI2M : Microstructures et Contraintes

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