Cold formability of automotive sheet metals: Anisotropy, localization, damage and ductile fracture

Junhe Lian, Deok Chan Ahn, Dong Chul Chae, Sebastian Münstermann, Wolfgang Bleck

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

2 Citations (Scopus)


Experimental and numerical investigations on the characterization and prediction of cold formability of two different types of automotive steel sheets, a ferritic stainless steel sheet (AISI 439) and a dual-phase steel sheet (DP600) are performed in this study. Due to the different microstructure configurations, these two steels show significant differences in plasticity behavior as well as failure mechanisms. The ferritic stainless steel shows strong anisotropic plastic deformation in terms of both yielding and hardening, whereas the dual-phase steel behaves quite isotropic resulting from the mixture of two phases. However, unlike the localization dominant failure mechanism of the ferritic stainless steel, the incompatible deformation due to the distinctions of the mechanical properties of two phases naturally results in early damage and extensive damage development prior to localization, or ductile fracture without localization. In this study, all these features are taken into account for an accurate prediction of formability. A general modelling framework with specifications for these separate features is formulated and applied to the two steels.

Original languageEnglish
Title of host publicationSheet Metal 2015
PublisherTrans Tech Publications Ltd.
Number of pages8
ISBN (Electronic)9783038354505
Publication statusPublished - 1 Jan 2015
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Sheet Metal - Erlangen-Nurnberg, Germany
Duration: 16 Mar 201518 Mar 2015
Conference number: 16

Publication series

NameKey Engineering Materials
ISSN (Print)1013-9826


ConferenceInternational Conference on Sheet Metal
Abbreviated titleSheMet


  • Damage
  • Fracture
  • Metal forming

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