J. Phys. IV France 08 (1998) Pr8-143-Pr8-150
A new rate-type gradient-dependent viscoplastic approach for stop-and-go strain band propagation. Numercial vs. physical experimentsC. Faciu1, A. Molinari2, M. Dablij2 and A. Zeghloul2
1 Institute of Mathematics of the Romanian Academy, P.O. Box 1-764, 70700 Bucharest, Romania
2 Université de Metz, Laboratoire de Physique et Mécanique des Matériaux, URA 1215 du CNRS, Ile du Saulcy, 57045 Metz, France
It is shown that the non-local rate-type constitutive equation proposed by Faciu & Molinari  can predict a large number of experimentally observed features of the kinetics of the Portevin-Le Châtelier (PLC) bands. Numerically obtained serrated yielding curves and staircase creep curves for strain and stress controlled problems, respectively, are compared with experimental curves. A good agreement between the phenomenological approach and microscopic aspects of the PLC effect is obtained.
© EDP Sciences 1998