Investigation of the effect of strain rate history on the stress-strain curves
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摘要: 利用普通SHPB实验系统、双试件SHPB实验系统，对一特种钢材进行了不同应变率历史的动态压缩实验，获得了不同应变率历史所对应的应力应变曲线。通过量化平均应变率相同的情况下不同应变率历史所对应的应力应变曲线的差别，以及量化应变率历史的恒定程度，初步分析了应变率历史对应力应变曲线的影响。研究结果表明：特别是在较高平均应变率下，应变率历史对试件材料的应力应变曲线有明显的影响，在材料动态本构关系研究中应当考虑应变率历史的影响。Abstract: Dynamic compression experiments on a special steel were carried out using a common SHPB system and a two-specimen SHPB system. The dynamic compression stress-strain curves were obtained for different strain rate history. The effect of strain rate history on the stress-strain curves was investigated through comparing the two stress-strain curves with the same average strain rate but different strain rate history for the same specimen. The results show that the stress-strain curves are significantly affected by the strain rate history, and this effect must be accounted for in the study of material constitutive relations.
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