滑动状态下地基刚度对轮轨接触特性的影响

摘要

高速铁路作为国民经济的基础设施,沿线分布长、区域广,因各地区土质不同造成地基刚度也不一样.本文通过建立轮对三维有限元热机耦合分析模型,参照合理地基刚度,研究分析了全滑动状态下地基刚度的改变对轮轨接触特性的影响.结果表明:地基刚度的改变对轮轨接触区域的温升影响并不明显;全滑动状态下轮轨接触区热量较为集中,使得接触斑的面积相对于静态分析时增加了2.2倍左右;全滑动状态下的等效应力由机械应力、热应力叠加而成,并且热应力居于主导地位.%Being the infrastructure of the national economy,high speed railway is widely distributed,and the foundation stiffness due to the regional soil is different.Based on the wheel-rail three-dimension finite element heat engine coupling analysis model,with reference to the reasonable foundation stiffness,this paper analysed the influence of the foundation stiffness change on the wheel-rail contact characteristics in full case of sliding mode.The results show that the change of the foundation stiffness does not have obvious effects on temperature rise of the wheel-rail contact area.The heat of wheel-rail contact area is relatively concentrated in case of full sliding mode,so that the area of the contact spot increases by about 2.2 times compared with the static analysis.The equivalent stress of full sliding mode is composed of mechanical stress and thermal stress,and the latter is dominant.