材料工程Issue(12)：7-13,7.
铝合金7050-T7451高温高应变率本构方程及修正
Research and Revise on Constitutive Equation of 7050-T7451 Aluminum Alloy in High Strain Rate and High Temperature Condition
摘要
Abstract
The flow stress behavior of 7050-T7451 aluminum alloy at high temperature and high strain rate was investigated by split Hopkinson pressure bar (SHPB) and quasi-static test system. The strain hardening parameters were obtained by the quasi-static test experiment data. The strain rate hardening parameter at various strain rates (400-2500S-1) and room temperature,and the thermal softening parameter at various temperatures where strain rate is 2500s-1 ,were obtained by the split Hopkinson pressure bar experiment data. A new thermal softening equation is proposed to revise the Johnson-Cook constitutive equation , where the a quintic polynomial equation is choosed as the new thermal softening equation. According to the comparison between predict curves and experiment curves of stress-strain at various temperatures, the modified constitutive equation can fit the experiment date well.关键词
铝合金7050/本构方程/流动应力/参数拟合Key words
aluminum alloy 7050/constitutive equation/flow stress/parameter extraction分类
矿业与冶金引用本文复制引用
滑勇之,关立文,刘辛军,崔海龙..铝合金7050-T7451高温高应变率本构方程及修正[J].材料工程,2012,(12):7-13,7.基金项目
国家重大专项资助项目(2010ZX04015-011) （2010ZX04015-011）
