FLD of AZ31 sheet under warm stretching and its prediction

Tetsuo Naka, Yasuhide Nakayama, Takeshi Uemori, Ryutaro Hino, Fusahito Yoshida, Masahide Kohzu, Kenji Higashi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Forming Limit Diagrams (FLDs) of a magnesium alloy (AZ31) sheet at various forming speeds (3 to 300 mm·mm-1) at several temperatures of 100-250°C were investigated by performing a punch stretch-forming test. The forming limit strains increased with temperature rise and with decreasing forming speed, where the effect of forming speed was stronger at higher temperatures. To describe such a characteristic of FLD of AZ31, the Marciniak-Kucznski type forming limit analysis was conducted using the Backofen-type constitutive equation (c = Cεnεm). In this analysis, the damage evolution in the necking zone was taken into account based on Oyane's ductile fracture criterion. The numerical results of the FLD show a good agreement with the corresponding experimental observations.

Original languageEnglish
Pages (from-to)6010-6015
Number of pages6
JournalInternational Journal of Modern Physics B
Issue number31-32
Publication statusPublished - Dec 30 2008
Externally publishedYes


  • AZ31
  • Forming limit diagram
  • Warm stretching

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics


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