Elasto-visco-plastic modeling of mild steels for sheet forming applications over a large range of strain rates

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Elasto-visco-plastic modeling of mild steels for sheet forming applications over a large range of strain rates

Type de document: Articles dans des revues avec comité de lecture
Auteur:
  PIPARD, Jean-Marc
  178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
  BALAN, Tudor
  178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
  ABED-MERAIM, Farid
  178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
  LEMOINE, Xavier
  178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
Date: 2013-08
Titre de la revue: International Journal of Solids and Structures

Résumé:

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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