摘要
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。
Based on Johnson-Cook material model,the deformation properties of a metal ring under impact loading were numerically analyzed.The friction calibration curves under impact load were obtained and compared with the quasi-static results.The effects of different loading speeds and different strain rate sensitivity coefficients on calibration curves and critical friction coefficient.The calculation results showed that the calibration curves under impact load have similar tendencies but obvious differences in quantity compared with the quasi-static results;both strain rate effect and inertia effect have influences on calibration curves during a ring specimen subjected to impact loading;the inertia effect plays a major role,and the influence of the strain rate effect is not very obvious;furthermore,there is a critical friction coefficient during the ring compression and it can be considered as an intrinsic property of a metal ring,it keeps a constant under different conditions.
出处
《振动与冲击》
EI
CSCD
北大核心
2015年第11期128-132,145,共6页
Journal of Vibration and Shock
基金
国家自然科学基金(11272304)资助
