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ID:40365151
大小:2.91 MB
页数:10页
时间:2019-08-01
《Zhouguiyuan_15_Fatigue damage mechanism of railway wheels under lateral forces》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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