Modeling the cold formability of dualphase steels on different length scales

Sebastian Münstermann, Junhe Lian, Napat Vajragupta

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

Abstract

Modern multiphase steels contain constituents of distinctive mechanical properties, so that they develop strong gradients in the local strain distribution during forming operations and this strongly promotes the microstructural damage evolution. Consequently, the material's resistance against ductile crack initiation sets the limits of cold formability and these can even be reached without any macroscopic necking phenomena. The modified Bai Wierzbicki (MBW) model has been proven the capability of providing an impressive accuracy of simulation results when applied to stretch forming tests as it describes ductile crack initiation and propagation. The consideration of the third invariant of the stress deviator on plasticity and ductile failure is a key factor for the model's high accuracy, but due to its phenomenological character its applicability for materials design is currently not given. Furthermore, the quantity of material parameters is so high that an industrial application of this model cannot be expected. Therefore the paper presents an alternative approach for parameter calibration relying on virtual experiments on representative volume elements, where the plastic strain localization theory is applied without any other damage model. (C) 2014 Elsevier Ltd.

Original languageEnglish
Title of host publication20TH EUROPEAN CONFERENCE ON FRACTURE
EditorsZ Zhang, B Skallerud, C Thaulow, E Ostby, J He
PublisherElsevier Science Publishers BV
Pages1050-1055
Number of pages6
DOIs
Publication statusPublished - 2014
MoE publication typeA4 Article in a conference publication
EventEuropean Conference on Fracture - NTNU, Trondheim, Norway
Duration: 30 Jun 20144 Jul 2014
Conference number: 20

Publication series

NameProcedia Materials Science
PublisherELSEVIER SCIENCE BV
Volume3
ISSN (Print)2211-8128

Conference

ConferenceEuropean Conference on Fracture
Abbreviated titleECF
CountryNorway
CityTrondheim
Period30/06/201404/07/2014

Keywords

  • cold formability
  • multiphase steels
  • MBW model
  • modelling on different length scales
  • PLASTICITY
  • FRACTURE

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