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説明
<jats:p> Forming Limit Diagrams (FLDs) of a magnesium alloy (AZ31) sheet at various forming speeds (3 to 300 mm·mm<jats:sup>-1</jats:sup>) 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 = Cε<jats:sup>n</jats:sup>ε<jats:sup>m</jats:sup>). 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. </jats:p>
収録刊行物
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- International Journal of Modern Physics B
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International Journal of Modern Physics B 22 6010-6015, 2008-12-30
World Scientific Pub Co Pte Lt