Zhouguiyuan_15_Fatigue damage mechanism of railway wheels under lateral forces

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1、TribologyInternational91(2015)160–169ContentslistsavailableatScienceDirectTribologyInternationaljournalhomepage:www.elsevier.com/locate/tribointFatiguedamagemechanismofrailwaywheelsunderlateralforcesnGuiyuanZhou,ChenggangHe,GuangWen,QiyueLiuTribologyResearchInstitute,StateKeyLaboratoryofT

2、ractionPower,SouthwestJiaotongUniversity,Chengdu,ChinaarticleinfoabstractArticlehistory:Underconditionsofcurvenegotiatingandhunting,lateralforceisgeneratedatthewheel/railinterfaceReceived16March2015thatcandamagethewheeltread.TherollingcontacttestswereperformedonaJD-1wheel/railReceivedinre

3、visedformsimulationapparatuswithdifferentlateralforcesbetweentherailandwheelrollers.Theresultsindicate8June2015thatplasticdeformationandmildweardominatedateachsideofthecontactarea,whilefatiguedamageAccepted8July2015dominatedatthemiddleregion.Drasticchangesinstressandstressdirectionfromthe

4、highstressregionAvailableonline17July2015tothelowerstressregioncanleadtoplasticaccumulationandtheinitiationoffatiguecracks.TheKeywords:formationandbreakingofmetaltonguemakebigcontributiontomateriallossinthiscondition.RCF&2015ElsevierLtd.Allrightsreserved.LateralforcePlasticdeformationFati

5、guecracks1.Introductionparalleltothesurface.Sub-surfacecrackstypicallynucleateunderthecontactsurfacewherethelargestshearstressoccursorintheIncreasingoftheoperationspeedandaxleloadofarailwaypresenceofstructuralinhomogeneitiessuchasinclusionsordefectsvehicleaggravatetheissueofrailwaywheelda

6、mageintermsof[14].Deep-surfaceinitiatedcracksaresimilartosub-surfacecrackssafetyandeconomy[1].Wheelsserveasavitalcomponentofabutarelocatedfartherawayfromthecontactpointandmayvehicle,bearingtheverticalloadofthetrainandconveyingthepropagateinalow-stressfieldifthedimensionislargeenough.tracti

7、onandbrakingforcesbetweenwheelandrailinsevereContactforcesbetweenwheelandrailareessentialfactorsthatoperatingconditions.Therefore,greatemphasishasbeenplacedondeterminethewearandRCFbehaviorsoftherim[15],andthereinvestigatingthewearandfatiguemechanismsofrailwaywheelst