文章编号：0258-2724(2024)02-0247-09DOI:10.3969/j.issn.0258-2724.20211043扣件刚度非线性对波磨区轮轨瞬态滚动接触行为的影响徐井芒，梁新缘，王凯，赵思琪，王平（西南交通大学高速铁路线路工程教育部重点实验室，四川成都610031）摘要：WJ-8型扣件橡胶垫板刚度在长期服役过程中表现出非线性特征，静刚度随荷载增加而降低，为提高三维瞬态滚动接触有限元模型计算精确性，本文以LMA踏面车轮及CHN60型钢轨为基础，基于显式积分算法，将以往研究中线弹性扣件转化为非线性扣件，建立考虑扣件刚度非线性特征的三维轮轨瞬态滚动接触有限元模型，研究刚度非线性对车轮与钢轨波磨间高频动态响应及瞬态接触行为的影响，并重点分析了波磨工况下时频域内轮轨接触力、轴箱加速度的变化信息.结果表明：扣件非线性对轮轨接触力变化影响明显，主要表现为车轮行驶至扣件前端时强振动导致橡胶垫板表现为柔软特性使轮轨接触力减小，车轮行驶至扣件上方时在轴重作用下振动减弱表现为刚硬特性使轮轨接触力增大，轮轨力变化差异最大达到13.1%.关键词：刚度非线性；瞬态滚动接触；波磨；显式有限元法中图分类号：U213.53；U211.5文献标志码：AInfluenceofFastenerStiffnessNonlinearityonWheel–RailTransientRollingContactBehaviorinCorrugatedAreaXUJingmang,LIANGXinyuan,WANGKai,ZHAOSiqi,WANGPing(MOEKeyLaboratoryofHigh-SpeedRailwayEngineering,SouthwestJiaotongUniversity,Chengdu610031,China)Abstract:ThestiffnessoftherubberpadoftheWJ-8fastenerexhibitsnonlinearcharacteristicsduringlong-termservice,andthestaticstiffnessdecreaseswiththeincreaseintheload.Inordertoimprovethecalculationaccuracyofthethree-dimensionaltransientrollingcontactfiniteelementmodel,theLMAtreadwheelandCHN60railwereused.Basedontheexplicitintegrationalgorithm,thelinearelasticfastenersinthepreviousresearchweretransformedintononlinearfastenerstoestablishathree-dimensionalwheel–railtransientrollingcontactfiniteelementmodelconsideringthenonlinearcharacteristicsoffastenerstiffness.Theinfluenceofstiffnessnonlinearityonthehigh-frequencydynamicresponseandtransientcontactbehaviorbetweenwheelandrailcorrugationwasstudied,andthechangeofwheel–railcontactforceandaxleboxaccelerationinthetime-frequencydomainundercorrugationco...
