Modeling the cold formability of dualphase steels on different length scales

Sebastian Münstermann, Junhe Lian, Napat Vajragupta

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference contributionScientificvertaisarvioitu

Abstrakti

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.

AlkuperäiskieliEnglanti
Otsikko20TH EUROPEAN CONFERENCE ON FRACTURE
ToimittajatZ Zhang, B Skallerud, C Thaulow, E Ostby, J He
KustantajaElsevier Science Publishers BV
Sivut1050-1055
Sivumäärä6
DOI - pysyväislinkit
TilaJulkaistu - 2014
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaEuropean Conference on Fracture - NTNU, Trondheim, Norja
Kesto: 30 kesäkuuta 20144 heinäkuuta 2014
Konferenssinumero: 20

Julkaisusarja

NimiProcedia Materials Science
KustantajaELSEVIER SCIENCE BV
Vuosikerta3
ISSN (painettu)2211-8128

Conference

ConferenceEuropean Conference on Fracture
LyhennettäECF
MaaNorja
KaupunkiTrondheim
Ajanjakso30/06/201404/07/2014

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