A Multiscale Model Based On Intragranular Microstructure: Influence Of Grain-Scale Substructure On Macroscopic Behaviour Of An IF-Steel During Complex Load Paths
Communication avec acte
Résumé
A microstructural model, based on Peeters' works, is implemented into a large strain self-consistent scheme, leading to the multiscale model which achieves, for each grain, the calculation of slip activity, with help of regularized formulation drawn from the visco-plasticity framework, and the dislocation microstructure evolution. This paper focuses on the relationship between macroscopic hardening/softening effects and induced microstructure during monotonic and two-stage strain paths.
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Article dans une revue avec comité de lectureFRANZ, Gérald; BEN ZINEB, Tarak; LEMOINE, Xavier; BERVEILLER, Marcel; ABED-MERAIM, Farid (Elsevier, 2009)In order to analyze the formability of steels in sheet metal forming, a ductility loss criterion is coupled with a multiscale model. The behavior at the mesoscopic (grain) scale is modeled by a large strain micromechanical ...
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Article dans une revue avec comité de lectureFRANZ, Gérald; BEN ZINEB, Tarak; LEMOINE, Xavier; BERVEILLER, Marcel; ABED-MERAIM, Farid (Elsevier, 2011)In this paper, the effects of microstructure and deformation mechanisms on the ductility of multiphase steels are investigated. To this end, a formability criterion based on loss of ellipticity of the boundary value problem ...
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Communication avec acteFRANZ, Gérald; BEN ZINEB, Tarak; LEMOINE, Xavier; BERVEILLER, Marcel; ABED-MERAIM, Farid (Curran Associates, Inc. / ICF, 2009)In order to investigate the impact of microstructures and deformation mechanisms on the ductility of materials, the criterion based on bifurcation theory first proposed by Rice is applied to elastic-plastic tangent moduli ...
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Communication sans acteThe development of a relevant constitutive model adapted to sheet metal forming simulations requires an accurate description of the most important sources of anisotropy, i.e. the slip processes, the intragranular substructure ...