Elasto-visco-plastic modeling of mild steels for sheet forming applications over a large range of strain rates |
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Authors: | Jean-Marc Pipard Tudor Balan Farid Abed-Meraim Xavier Lemoine |
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Institution: | 1. Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux, LEM3, UMR CNRS 7239, Arts et Métiers ParisTech, 4 rue Augustin Fresnel, 57078 Metz Cedex 03, France;2. ArcelorMittal R&D Global Maizières, Automotive Product, Voie Romaine, BP 30320, 57283 Maizières-Lès-Metz Cedex, France |
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Abstract: | A physically based elasto-visco-plastic constitutive model is presented and compared to experimental results for three different mild steels. The experiments consist of tensile tests ranging from quasi-static conditions up to strain rates of 103 s?1 as well as quasi-static simple and reverse shear tests at different amounts of pre-strain. Additional two-step sequential mechanical tests (Bauschinger and orthogonal effects) have been performed to further evaluate the ability of the model to describe strain-path changes at moderate/large strains. The model requires significantly fewer material parameters compared to other visco-plasticity models from the literature, while being able to describe some of the main features of the strain-rate sensitivity of mild steels. Accordingly, the parameter identification is simple and intuitive, requiring a relatively small set of experiments. The strain-rate sensitivity modeling is not restricted to a particular hardening law and thus provides a general framework in which advanced hardening equations can be adopted. |
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Keywords: | Constitutive behavior Visco-plasticity Microstructure-related parameters Mild steel Finite element simulation |
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