基于Johnson-Cook材料模型,应用数值模拟的方法，研究了圆环件在冲击载荷作用下的压缩变形规律。得到了冲击载荷下的摩擦系数-变形特性曲线，由此研究了不同载荷幅值（加载速度）、不同应变率敏感系数下的圆环内径变化规律以及对临界摩擦系数的影响。结果表明：摩擦系数-变形特性曲线和准静态结果基本趋势一致但有较大的差异，其中惯性效应起主要作用，应变率效应则起着次要作用。另外，此过程存在着临界摩擦系数，而应变率效应和惯性效应对圆环的临界摩擦系数影响不大，因此，临界摩擦系数可以作为试件的内在属性，应用于圆环的冲击锻压工程。
Abstract
Based on the Johnson-Cook material model, the deformation properties of metal ring under impact loading were numerically analyzed. Friction calibration curves under impact load were obtained and they were made comparison with the quasi-static results. The influence on calibration curves and critical coefficient of friction by different loading speeds and different strain rate sensitivity coefficient was illustrated. The calculation results showed that calibration curves under impact load had similar tendency but obvious difference in quantity with the quasi-static results. Both the strain rate effect and the inertia effect had influences on calibration curves when the ring specimen subjected to impact loading. The inertia effect played a major role, and the influence by the strain rate effect showed not very obvious. Furthermore, critical coefficient of friction existed during the ring compression and it can be considered as an intrinsic property of metal ring, which resulted from that it kept constant in different calculation conditions.
关键词
冲击动力学 /
Hopkinson压杆(SHPB) /
圆环压缩 /
动态摩擦 /
应变率效应 /
惯性效应
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Key words
impact /
SHPB /
ring compression /
dynamic friction /
strain rate effect /
inertia effect
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