摘要
为了得到轮轨接触应力较精确的数值解,分别采用Hertz接触理论模型、传统有限元模型及改进有限元模型求解轮轨接触应力,并从计算精度和计算时间方面对3种模型进行了比较。结果表明,有限元模型较Hertz接触理论模型更能反映轮轨接触的实际情况,改进的有限元模型在允许的计算精度范围内可以大大提高计算效率;轮轨最大接触应力发生在轮轨表面以下约2.5mm的位置,呈弧形分布,并随轴重的增加而增大,高应力区宽度增大,离初始接触位置一定距离处的钢轨表面出现高应力区。
In order to obtain the accurate numerical solution of wheel/rail contact stress, Hertzian contact theory and finite element method were used to calculate the wheel and rail contact stress. The difference of three calculation models in calculation accuracy and computing time were compared. The results show that the FEM method can better approach to the practice and the computational efficiency could be greatly improved using the improved FEM model in condition of meeting precision requirement. The maximum wheel-rail contact stress occurs about 2.5 mm in the surface layer of rail, and the distribution of the high stress appears to arc shaped phenomenon. The maximum stress and the range of the high stress increase with increasing the axle load. However, the range of high stress is approaching to the surface layer of rail as the axle load increasing.
出处
《润滑与密封》
CAS
CSCD
北大核心
2009年第7期28-32,共5页
Lubrication Engineering
基金
国家自然科学基金项目(10876034)
