EURODYMAT 2006 - 8th International Conference on Mehanical and Physical Behaviour of Materials under Dynamic Loading
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 435-441
DOI: 10.1051/jp4:2006134067

Finite element simulations of the Portevin–Le Chatelier effect in aluminium alloy

O.S. Hopperstad¹, T. Børvik¹, T. Berstad² and A. Benallal<sup>3

1</sup>  Structural Impact Laboratory – SIMLab, Department of Structural Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
²  SINTEF Materials and Chemistry, 7465 Trondheim, Norway
³  Laboratoire de Mécanique et Technologie, LMT-Cachan, 61 avenue du Président-Wilson, 94235 Cachan Cedex, France

Published online: 26 July 2006

Abstract
Finite element simulations of the Portevin-Le Chatelier effect in aluminium alloy 5083-H116 are presented and evaluated against existing experimental results. The constitutive model of McCormick (1988) for materials exhibiting negative steady-state strain-rate sensitivity is incorporated into an elastic-viscoplastic model for large plastic deformations and implemented in LS-DYNA for use with the explicit or implicit solver. Axisymmetric tensile specimens loaded at different strain rates are studied numerically, and it is shown that the model predicts the experimental behaviour with reasonable accuracy; including serrated yielding and propagating bands of localized plastic deformation along the gauge length of the specimen at intermediate strain rates.

© EDP Sciences 2006