AZ31板の非比例張出し成形に及ぼす温度と速度の影響(単軸引張り後のFLD)

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Magnesium alloy usually exhibit low ductility at room temperature due to its hexagonal close-packed structure. To overcome the problem, the best choice of forming technologies would be warm press-forming since the ductility becomes considerably higher when heating-up the sheets. In order to determine the optimum condition of press-forming for magnesium alloy sheets, in the present work, the effects of temperature, strainrate and deformation by non-proportional strain path on forming limit diagram (FLDs) for fine-grain AZ31 magnesium alloy sheet were investigated. The pre-strain were added of 1/3 and 2/3 in the fracture elongation by uniaxial tension. The FLDs of non-proportional strain path were determined by performing punch stretchforming tests at various forming speeds (3, 30 and 300 mm?min-1) at temperatures of 150, 200 and 250℃. The forming limit strains increased with temperature rise and with decreasing forming speed, where the effect of forming speed was stronger at higher temperatures. And the forming limit strain increased with non-proportion strain path after uniaxial tension compared with the proportion strain path. To describe such a characteristic of FLD of AZ31, the Marciniak-Kucznski type forming limit analysis was conducted using the Backofen-type constitutive equation ( ). 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.
2009-02-27

AZ31板の非比例張出し成形に及ぼす温度と速度の影響(単軸引張り後のFLD)

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