Hardness-based plasticity and fracture model for quench-hardenable boron steel (22MnB5)

L Greve, Tom Eller, M Medricky, M.T. Andres

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Abstract

A comprehensive strain hardening and fracture characterization of different grades of boron steel blanks has been performed, providing the foundation for the implementation into the modular material model (MMM) framework developed by Volkswagen Group Research for an explicit crash code. Due to the introduction of hardness-based interpolation rules for the characterized main grades, the hardening and fracture behavior is solely described by the underlying Vickers hardness. In other words, knowledge of the hardness distribution within a hot-formed component is enough to set up the newly developed computational model. The hardness distribution can be easily introduced via an experimentally measured hardness curve or via hardness mapping from a corresponding hot-forming simulation. For industrial application using rather coarse and computationally inexpensive shell element meshes, the user material model has been extended by a necking/post-necking model with reduced mesh-dependency as an additional failure mode. The present paper mainly addresses the necking/post-necking model.
Original languageEnglish
Pages (from-to)571-574
JournalAIP conference proceedings
Volume1567
DOIs
Publication statusPublished - 6 Jan 2013

Keywords

  • IR-91242
  • METIS-303861

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