利用带有加热装置和同步组装系统的高温Hopkinson压杆系统对某不锈钢材料在温度20 ~ 800℃时,应变率103 ~ 104s-1下的动态压缩力学性能进行了测试,得到了材料在不同温度和应变率耦合作用下的真实应力-应变曲线.对比准静态结果,考察了材料流动应力的温度和应变率敏感性,并根据热激活位错运动理论对其内在机理进行了解释和探讨.试验表明,材料具有显著的热软化和应变率强化效应;且高温时,材料的温度敏感性、应变率敏感性均显著增加.
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