AZ31Mg合金板の機械的性質に及ぼすアスペクト比の影響

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Numerical simulations have been taken to the press forming of the sheet material. The material property is used for the simulation. The material property uses the mechanical property obtained by the tensile test based on JIS specimens. However, in actual factories, the press forming was performed in various figures. It is unusual that performed in the aspect ratio of JIS specimens. It is possible that the effect of mechanical properties the results of the simulation. Therefore, mechanical properties were investigated. In this research, it aimed to know the effect of aspect ratio on mechanical properties for magnesium alloy (AZ31) sheet. Uniaxial tension tests were performed using type JIS-13B specimens (60×12.5 mm in the parallel portion) at various forming speeds (3, 30 and 300 mm・min-1) in an Instron-type testing machine (250 kN in capacity). The testing temperatures were 150, 200 and 250 oC. The tensile direction were rolling direction, 45 degrees and tranceverce. We used various kinds of test pieces. The flow stress decreased with the temperature rise, therefore the effect of warm forming of the AZ31 magnesium alloy sheet was shown. The fracture elongation increases with aspect ratio rise and temperatures rise and with decreasing forming speed. The effect of the aspect ratio was not occurred in the uniform elongation. Therefore, increasing the fracture elongation was effected by the local elongation. And the effect of aspect ratio was not remarkably occurred in other mechanical properties.
2011-01-18

AZ31Mg合金板の機械的性質に及ぼすアスペクト比の影響

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