中文摘要：

利用分离式Hopkinson压杆实验装置（SHPB）对无氧铜进行了常温下不同应变率（2 500 s^-1-15 500 s^-1）的动态力学性能进行了测试,得到常温下无氧铜的真实应力-真实应变曲线,并分别通过Power-Law本构模型和JohnsonCook本构模型对其进行了拟合。结果表明：无氧铜在受到动态压缩载荷的作用时,其塑性流动应力对应变率并没有表现出敏感的趋势,但对于材料的屈服应力则在应变率高于14 000 s^-1时明显增加,同时材料的应变强化效果降低,另外,相较于Johnson-Cook本构模型,Power-Law本构模型能够更准确的预测无氧铜在高应变率下的塑性流动应力。

英文摘要：

The dynamic mechanical properties of oxygen free copper has been tested under the different strain rate（ 2 500s^- 1- 15 500 s^- 1） at the room temperature by split Hopkinson pressure bar（ SHPB）,the true stress-true strain curves has been obtained. Power-Law constitutive model and Johnson-Cook constitutive model have been built to fit the experimental result from SHPB test of oxygen free copper. The results show that the plastic flow stress of oxygen free copper is not sensitive to the strain rate,however,the yield stress increases obviously and the strain strengthening effect decrease when the the strain rate is higher than 14 000 s^- 1. In addition,the Power-Law constitutive model can predict the plastic flow stress of the oxygen free copper more accurately than the Johnson-Cook constitutive model at the high strain rate.