无氧铜平面冲击波实验的横向应力测试及屈服强度确定

Measurement of transverse stress and determination of yield stress for OFHC copper subjected to planar shock

为直接确定平面冲击波实验中无氧铜的流动应力,测量了试件中的纵向应力和横向应力,得到了试件中流动应力随时间的变化。采用构建的7种本构模型对无氧铜平面冲击波实验进行数值模拟,比较了实验结果与理论计算结果。研究指出,由SHPB等确定的中等应变率本构并不能拓宽应用于平面冲击波实验。

Planar shock wave experiments for OFHC. copper were carried out, and the yield stresses of OFHC copper were obtained from the longitudinal and transverse stresses recorded by the manganin gauges. Numerical simulations of the planar shock tests for OFHC copper were performed by using the constructed seven constitutive models and compared with the experimental results. Constitutive models at high pressures and high strain rates were discussed. Results indicate that the Johnson-Cook or Zerilli-Armstrong constitutive models determined by the SHPB tests can not be applied to planar shock experiments.