不锈钢材料的动态力学性能及本构模型  

Dynamic mechanical behavior and constitutive model of stainless steel

作　　者：尚兵[1] 盛精[2] 王宝珍[1] 胡时胜[1] 

机构地区：[1]中国科学技术大学中国科学院材料力学行为和设计重点实验室,安徽合肥230026 [2]湖北汽车工业学院机械系,湖北十堰442002

出　　处：《爆炸与冲击》2008年第6期527-531,共5页Explosion and Shock Waves

摘　　要：利用带有温度调控系统的SHPB实验装置测定了0Cr17Mn5Ni4Mo3Al不锈钢在3种应变率(3001、000、2 700 s-1)、4种环境温度(25、300、500和700℃)下的应力应变关系;在液压伺服材料试验机(MTS)上进行了3种温度下的准静态(0.000 5 s-1)压缩实验。实验结果表明:该不锈钢有明显的应变率强化效应和温度软化效应,并且随着环境温度的升高,应变率强化效应减弱。对Johnson-Cook模型进行了修正,考虑了冲击过程中绝热温升引起的软化效应。修正后的Johnson-Cook模型与实验结果吻合较好。Stress-strain curves of 0Cr17MnSNi4Mo3Al, at three Strain rates of 300,1 000,2 700 s^-1 and four temperatures of 25,300,500,700 ℃ were experimentally obtained by using the split Hopkinson pressure bar equipped with a temperature controller. And the quasi-static experiment （0. 000 5 s^-1） was done in the material test system at three temperatures of 25,300,500 ℃. Experimental results show that the flow stress decreases with temperature but increases with strain and strain rate. The traditional Johnson-Cook model was modified considering the thermal softening caused by the impact adiabatic process. The modified Johnson-Cook model is in good agreement with the experimental results.

关 键 词：固体力学 本构关系 SHPB 不锈钢 Johnson-Cook模型 温度效应 应变率效应 

分 类 号：O347.3[理学—固体力学]