Numerical simulation of complex ratcheting tests with a multi-mechanism model type

The paper is devoted to the study of the capabilities of the so called 2M1C model, which was proposed some years ago by one of the authors. The main originality of the model lies in its loading function that composes 2 mechanisms (2M) to build one yield criterion (1C). The predictions of the model are evaluated by considering 1D and 2D ratcheting test results of the literature. Such evaluation reveals the difficulty for the 2M1C model to describe simultaneously 1D and 2D ratcheting using the same set of material parameters. This weakness is generally observed for most of the existing phenomenological models. In order to correct the problem, a modification of the kinematic hardening rules is proposed. A comparison between the predictions of the new model with the same set of ID and 2D ratcheting test results, considered above, leads to encouraging conclusions about the capabilities of the new formulation. (c) 2005 Elsevier Ltd. All rights reserved.