J. Phys. IV France 120 (2004) 161-168
An experimental mock-up for the study of steel behaviour at high temperature during phase transformationY. Vincent1, J.-M. Bergheau2, J.-B. Leblond3 and J.-F.Jullien1
1 URGC, INSA, 20 avenue Albert Einstein, 69621 Villeurbanne Cedex, France
2 LTDS, UMR 5513 CNRS/ECL/ENISE, 58 rue Jean Parot, 42023 Saint-Etienne Cedex 2, France
3 LMM, UMR 7607 CNRS/Université Paris VI, 8 rue du Capitaine Scott, 75015 Paris, France
In most numerical simulations of welding, due to the very short times involved, viscoplastic effects are neglected. However an experimental mock-up developed at INSA has evidenced the possible importance of such effects, which must therefore be incorporated in a more refined description of the material behaviour. This paper presents such a description; an extension of Leblond's model for transformation plasticity, accounting for the dependence of mechanical properties upon strain rate, is proposed. Finite element analyses using elastic-plastic or elastic-viscoplastic constitutive laws are compared with experiments, and it is found that incorporation of viscoplastic effects significantly improves the quality of the agreement between numerical and experimental results.
© EDP Sciences 2004