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International Journal for Multiscale Computational Engineering
Facteur d'impact: 1.016 Facteur d'impact sur 5 ans: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Imprimer: 1543-1649
ISSN En ligne: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.2017020395
pages 443-458

VALIDATION OF THE DUAL-PHASE STEEL FAILURE MODEL AT THE MICROSCALE

Konrad Perzyński
Department of Applied Computer Science and Modeling, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059, Cracow, Poland
Yuriy Ososkov
U.S. Steel Canada, Hamilton, Ontario, Canada
David S. Wilkinson
Materials Science & Engineering Department, McMaster University, Hamilton, Ontario, Canada
Mukesh Jain
Mechanical Engineering Department, McMaster University, Hamilton, Ontario, Canada
Jiangting Wang
Institute for Frontier Materials, Deakin University, Geelong, Victoria 3217, Australia
Lukasz Madej
Department of Applied Computer Science and Modeling, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059, Cracow, Poland

RÉSUMÉ

Dual-phase (DP) steel sheets are subjected to large plastic strains during forming of the body and structures of automotive components. These steels primarily contain hard martensite and soft ferrite phases in their microstructure and involve brittle and ductile fracture mechanisms for the ferrite and martensite phases, respectively. An uncoupled, multiscale finite-element model consisting of continuum (or macro) and microstructural (or micro) scales for large uniaxial tensile plastic deformation and failure of DP steel is developed. This model, based on a digital material representation (DMR) approach, is presented and validated with experimental results. The micromodel incorporates the above phase-specific fracture mechanisms, utilizes experimentally measured DP steel microstructures obtained as scanning electron microscopy (SEM) images, stress–strain (or flow curves) of individual ferrite and martensite phases as inputs, and deformation boundary conditions from two-scale macromodels of the uniaxial tensile test. The response of the micromodel in terms of local fracture behavior of the individual phases at large strains is compared with an experimental in situ SEM uniaxial tensile deformation study of the DP steel microstructure in the literature and good agreement is observed.