Effects of Strain Rate and Temperature on Yield Locus for AZ31 Magnesium Alloy Sheet

Abstract:

The yield locus of type AZ31 magnesium alloy sheet was obtained by performing biaxial tensile tests, using cruciform specimens, at temperatures of 100, 150, 200, 250 and 300 P o PC at strain rates of 10P -2 P, 10P -3 P and 10P -4 PsP -1 P. Based on the experimental results, the effects of strain-rate and temperature on the yield locus was discussed. The size of yield locus drastically decreased with increasing temperature and decreased with decreasing strain-rate. Neither von Mises’s criterion or Hill’s can well predict the shape of the yield locus of this sheet metal. Instead of these quadratic yield functions, the yield criterion of Logan-Hosford or Barlat is a better choice for the accurate description of biaxial stress-strain responses at high temperature.

• Periodical: Key Engineering Materials (Volumes 340-341)
• Pages: 119-124
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.340-341.119
• Online since: June 2007
• Authors: Tetsuo Naka, Masanori Hayakashi, Yasuhide Nakayama, Takeshi Uemori, Masahide Kohzu, Kenji Higashi, Fusahito Yoshida
• Keywords: Biaxial Tensile Test, Mg Alloy Sheets, Strain Rate, Temperature, Warm Press Forming, Yield Criterion, Yield Locus

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