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考虑棘轮效应的高速轮轨粗糙表面法向接触刚度研究

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2017年6月 第42卷第6期 润滑与密封 LUBRICATION ENGINEERING Jun.2017 V01.42 No.6 DOI:10.3969/j.issn.0254—0150.2017.06.002 考虑棘轮效应的高速轮轨粗糙表面法向接触刚度研究+ 肖乾1’2方姣1 昌超1 郑继峰1 四川成都610031) (1.华东交通大学载运工具运用工程教育部重点实验室江西南昌330013; 2.西南交通大学牵引动力国家重点实验室 摘要:轮轨接触表面状态直接影响轮轨接触刚度,而高速列车轮轨滚动接触过程中,轮轨表层材料产生弹塑性变 形,且轮轨接触表面在循环接触载荷作用下,轮轨表层材料塑性变形累积产生棘轮效应,因此,研究高速轮轨法向接 触刚度时要考虑棘轮效应。基于Weierstrass—Mandelbrot函数分形理论建立高速轮轨滚动接触粗糙度数值模型,考虑轮 轨滚动接触棘轮效应,采用非线性有限元软件ABAQUS建立高速轮轨滚动接触微观有限元模型。数值计算结果表明: 接触载荷作用下考虑轮轨弹塑性变形可更为准确分析高速轮轨法向接触刚度;循环接触载荷作用下,钢轨表层材料等 效塑性应变随接触载荷循环次数增加先增加后趋于稳定,从而导致轮轨接触刚度也先下降然后趋于稳定;在相同接触 载荷循环次数作用下.法向载荷对高速轮轨接触刚度影响明显.而摩擦因数对轮轨法向接触刚度影响较小。 关键词:棘轮效应;高速列车;轮轨关系;接触刚度;分形理论 中图分类号:THl 17 文献标志码:A 文章编号:0254—0150(2017)06-007-04 Research on Normal Contact FANG Jia01 Sti‰ess between Rough Surfaces of High-speed (1.Key WheeL/Rail Considering Ratchet Effect CHANG Cha01 ZHENG Jifen91 XIAO Q Janl-2 Laboratory of Vehicle Operation Engineering of Ministry of Education,East China Jiaotong University, Nanchang Jiangxi 33001 3,China;2.State Key Laboratory of Traction Power,Southwest China Jiaotong University, Chengdu Sichuan Abstract:The formation states 610031,China) contact of wheel/rail contact surfaces directly affect the wheel/rail contact stiffness,while the plastic de- is produced in the wheel/rail Surface materials during the rolling process of high—speed train,and the ratchet effect is produced caused by the accumulation of wheel—rail surface Therefore,the ratchet effect should be considered when studying the A roughness numerical model of high—speed plastic deformation under cyclic contact load. contact normal stiffness of the high—speed wheel/rail. on wheel/rail rolling contact contact was established based fractal theory of Weier- strass.Mandelbrot function,and wheel/rail rolling nite element software package microscopic finite element model was constructed by nonlinear fi— contact ABAQUS based on normal stiffness theory and considering the ratchet effect of of wheel/rail rolling contact.The numerical calculation results show that there may be more accurate analysis tact normal con— stiffness by considering the role of plastic deformation of high—speed wheel/rail.Under cyclic contact load,the equiva— lent plastic strain of rail surface material is increased firstly then trends to be stable with the increase of contact load cy— cles,and the wheel/rail contact stiffness is decreased firstly then also trends to be stable.Under the same contact load cy— on con— cles,normal



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