Influence of the plastic material behaviour on the prediction of forming limits

H. Vegter, C.H.L.J. ten Horn, A.H. van den Boogaard

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

2 Citations (Scopus)

Abstract

Prediction of the onset of necking is of large importance in reliability of forming simulation in present automotive industry. Advanced material models require accurate descriptions of the plastic material behaviour including the effect of strain rate [1, 3]. The usual approach for identifying the forming limits in industry is the comparison of a calculated strain map (major against minor strain) with a measured forming limit curve. This approach does not take into account the influence of strain path changes. Prediction of forming limit curves [4] with classical material models can already demonstrate that the forming limits are influenced by this strain path change effect. Including the effect of strain rate on the plastic material behaviour has a strong influence in prediction of onset of instability [2]. Neglecting this effect leads to underestimation of forming capacity of the material in stretch forming parts in particular. The shape of the yield locus [1, 2] will influence the predicted forming limit curves in the region from plane strain to bi-axial. Damage controlled failure will become more important using (advanced) high strength steels. This will affect the stress strain curve at high deformation grades. The work hardening is not only controlled by dislocation interaction, but also by void growth and possible presence of micro-cracks at the interface between the hard en soft phases.
Original languageEnglish
Title of host publicationMaterials processing and design: modeling, simulation and applications
Subtitle of host publicationNUMIFORM '07 : proceedings of the 9th International Conference on Numerical Methods in Industrial Forming Processes, Porto, Portugal, 17-21 June, 2007
EditorsJ.M.A. César de Sá, Abel D. Santos
Place of PublicationMelville, NY
PublisherAmerican Institute of Physics
Pages87-92
ISBN (Electronic)978-0-7354-0416-8
ISBN (Print)978-0-7354-0415-1
DOIs
Publication statusPublished - 17 Jun 2007
Event9th International Conference on Numerical Methods in Industrial Forming Processes, NUMIFORM 2007 - Porto, Portugal
Duration: 17 Jun 200721 Jun 2007
Conference number: 9

Publication series

NameAIP Conference Proceedings
PublisherAIP
Number1
Volume908
ISSN (Print)0094-243X

Conference

Conference9th International Conference on Numerical Methods in Industrial Forming Processes, NUMIFORM 2007
Abbreviated titleNUMIFORM
CountryPortugal
CityPorto
Period17/06/0721/06/07

Keywords

  • Plastic instability
  • Forming limits
  • Material modeling

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    Vegter, H., ten Horn, C. H. L. J., & van den Boogaard, A. H. (2007). Influence of the plastic material behaviour on the prediction of forming limits. In J. M. A. César de Sá, & A. D. Santos (Eds.), Materials processing and design: modeling, simulation and applications: NUMIFORM '07 : proceedings of the 9th International Conference on Numerical Methods in Industrial Forming Processes, Porto, Portugal, 17-21 June, 2007 (pp. 87-92). (AIP Conference Proceedings; Vol. 908, No. 1). Melville, NY: American Institute of Physics. https://doi.org/10.1063/1.2740793