Prediction of forming limits for voided anisotropic sheets using strain gradient dependent yield criterion

Young Suk Kim, Hyun Sung Son, Seung Han Yang, Sang Ryong Lee

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations

Abstract

In order to design and optimize a sheet metal forming process, the precise prediction of forming limits of sheet materials is needed. The purpose of this work is to predict theoretically the forming limit diagrams (FLD) of voided anisotropic sheets under the scheme of Marciniak and Kuczynski (M-K) model. The analysis employs the Gurson's yield function for voided sheet metals in conjunction with Barlat and Lian's 1989 anisotropic yield criterion. The effect of strain gradient dependent yield criterion introducing a strain gradient term in flow stress is incorporated. To confirm the validity of the proposed M-K model, the predicted FLD was compared with experimental results of steel sheets. It was found that the predictions of forming limits for voided sheets were in good agreement with the experimental data.

Original languageEnglish
Pages (from-to)395-400
Number of pages6
JournalKey Engineering Materials
Volume233-236
Issue numberI
StatePublished - 2002
EventProceedings of the 6th Asia-Pacific Symposium on Engineering Plasticity and Its Applications (AEPA2002) - Sydney, NSW, Australia
Duration: 2 Dec 20026 Dec 2002

Keywords

  • Forming limit diagrams FLD
  • Marciniak-Kuczynski (M-K) model

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