The project takes place within the general framework of the virtual forming of metallic sheet structures, like automotive structural parts, that undergo firstly deep drawing operations involving large equivalent plastic strains and ductile damage, and secondly cyclic loadings during their lifetime. In order to gain weight via decreasing the material thickness, accurate and predictive new models of the material behavior should be implemented, that will consider both the forming steps and the subsequent in-service loadings.
This PhD work is part of a global project in virtual forming, aiming at developing an original model for the static and cyclic mechanical behavior of steel metallic sheets, including ductile damage and rupture. ESI Group coordinates this project, which involves three academic partners: University of Technology of Troyes in France (UTT, http://www.utt.fr/en/index.html in France), Pohang University of Science and Technology (POSTECH, http://www.postech.ac.kr, in South Korea) and LIMATB, University of South Brittany. Two advanced models [1,2] of the mechanical behavior at room temperature of metallic materials will be implemented in the finite element code Abaqus (via UMAT and VUMAT). This task will be performed in collaboration with UTT and POSTECH.
As these models both involve complex hardening, anisotropy and its evolution with strain, viscosity, ductile damage and rupture, a dedicated procedure should be proposed. Therefore, the aim of this PhD is dedicated to the identification procedure of material parameters for these models and validation for forming and in-life predictions. A combined experimental and numerical approach is to be developed.
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