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分离式霍普金森压杆(SHPB)被广泛应用于测试混凝土类材料在高应变率(10~103 s-1)下的动态增强效应。为更好地理解这类问题,进行了数值模拟研究,采用J2本构模型研究SHPB试验中的纵向惯性效应,线性Drucker-Prager模型研究SHPB试验中的径向惯性效应。研究结果表明:纵向惯性效应不影响动态增强因子;径向惯性效应对动态增强因子有影响,但不是混凝土类材料在高应变率下动态增强因子提高的最主要原因。
Split Hopkinson Pressure Bar (SHPB) is widely used to test the dynamic reinforcement effect of concrete based on high strain rate (10 ~ 103 s-1). In order to better understand this kind of problem, a numerical simulation study was conducted. The J2 model was used to study the longitudinal inertia effect in SHPB test. The linear Drucker-Prager model was used to study the radial inertia effect in SHPB test. The results show that: the longitudinal inertia effect does not affect the dynamic enhancement factor; the radial inertia effect has an impact on the dynamic enhancement factor, but it is not the most important reason for the dynamic enhancement factor of the concrete material at high strain rate.