Experimental Study on Static and Dynamic Mechanical Behavior of 20CrMnTi Gear Steel
Dry high-speed cutting of spiral bevel gear is a non-linear dynamic process, involving partial high cutting temperature, high shear fracture, and high strain rate and so on. The accurate description of gear materials mechanical characteristics in such physical environment is the foundation of dry high-speed cutting numerical simulation. But so far, no papers have been found in this regard. In this paper, based on the static high temperature tensile tests and Split Hopkinson Tension Bar(SHTB) high strain rate tensile tests, the static and dynamic mechanical behavior of the automobile gear steel 20CrMnTi in forged and normalized condition is studied; the elastic modulus, yield limit and ultimate strength are obtained; the Johnson-Cook material constitutive model is established. Experimental results show that 20CrMnTi gear steel has demonstrated a comparatively obvious yield phenomenon both in static and high strain rate state, has emerged rather obvious necking phenomenon before fracture; it has showed a certain degree of temperature softening effect and strain rate hardening effect and its yield limit has a certain sensitivity to temperature and strain rate.
20CrMnTi gear steel Johnson-Cook constitutive model Dynamic mechanical properties Split Hopkinson Tension Bar
Liu Ganhua Yan Hongzhi
College of Mechanical and Electrical Engineering, Central South University, Changsha, Hunan, 410083, College of Mechanical and Electrical Engineering, Central South University, Changsha, Hunan, 410083,
国际会议
长沙
英文
1316-1320
2010-03-13（万方平台首次上网日期，不代表论文的发表时间）