On application of a damage plasticity model to sheet metal forming of DP steel

J. Lian*, N. Vajragupta, S. Munstermann, W. Bleck

*Corresponding author for this work

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

5 Citations (Scopus)

Abstract

Advanced high strength steels (AHSS) are Increasingly applied In the automotive Industry due to their excellent mechanical properties. The microstructure of these steels Is designed by constituents of strong distinctions in mechanical properties to provide the superior behaviors, which on the other hand results in new damage mechanisms. In the dual phase steels the damage exhibits a rather complex situation: voids are generated by the debonding of the hard phase from the matrix and the inner cracking of the hard phase besides by inclusions. Consequently the damage evolution can trigger the final failure with the absence of strain localization. In this study, to describe the material degradation the damage Induced softening Is taken into account in the plasticity model which considers the effect of stress state, I.e. hydrostatic pressure and Lode angle. An accumulated formation of damage is adopted in the framework of continuum damage mechanics (CDM). Accordingly a user subroutine VUMAT for Abaqus/Explicit is developed. The metal forming process is performed experimentally and numerically, and the resulting forming limits curves (FLC) are compared. Furthermore the underlying damage mechanisms are revealed by microscopic modeling based on real microstructure with the application of extended finite element method (XFEM).

Original languageEnglish
Title of host publicationSpecial Edition
Subtitle of host publication10th International Conference on Technology of Plasticity, ICTP 2011
Pages901-906
Number of pages6
Publication statusPublished - 1 Dec 2011
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Technology of Plasticity - Aachen, Germany
Duration: 25 Sep 201130 Sep 2011
Conference number: 10

Conference

ConferenceInternational Conference on Technology of Plasticity
Abbreviated titleICTP
CountryGermany
CityAachen
Period25/09/201130/09/2011

Keywords

  • Damage plasticity model
  • DP steel
  • Formability
  • Sheet forming
  • XFEM

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