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1、西南交通大學(xué)碩士學(xué)位論文車輪鋼滾動磨損與摩擦特性研究姓名：王蘊華申請學(xué)位級別：碩士專業(yè)：機械設(shè)計及理論指導(dǎo)教師：郭俊20090401西南交通大學(xué)碩士研究生學(xué)位論文第ll頁AbstractTherailwaytransportationsystemspossessingalotofuniqueadvantagesareirreplaceableintoday’Stransportation．Butwiththeprogressmade，someproblemsneverseemtoleaveUS，andmoreover，newproblemscontinuetocrop
2、-up．Thewheeltreaddamageincludedintheissueasrelationshipbetweenwheelandrailisparticularlyprominent，hindersthedevelopmentofrailwaytransportationsystemsgreatly．Wheelfailurecarlnotonlyaffectthenormaloperations，butalsoendangerthesafetyofrailtransport．Therefore，thestudyonwheeltreaddamagemecha
3、nismisofpositivesignificanceforimprovingtheeconomicefficiencyofrailtransportandthepromotionofrailtransport．Thewheeltreaddamageisintegrationofwheel—railinteractionwhichisacomplexprocessincludingtribologicalphenomenaandthematerialresponsetoextemalimpact，SOitissubjecttoalargenumberoffactor
4、s．Inordertoprovidesomevaluableconclusionstoreducethe仃eaddamage．rollingfrictionandwearbehaviorsofwheelsteelundervariousconditionswereinvestigatedwithNENE2frettingfatigue—testingmachineandreciprocatingrollingtestingapparatusinthisthesis．MainconclUSionsweredrawnasfollows：(1)Thecharacterist
5、icofrollingwearissignificantlydifferentunderdifferentbrakingforce，andchangesregularly．Theweardamageofwheelsurfacewouldtransformfromslightscratchtoabrasivewear，adhesionandfatiguespallingwiththecoefficientoffrictionincreasing．(2)Withthefrequencyincreasing，thewearmechanismofwheelsteelsubje
6、ctedtopartialslipmakesatransformfromabrasiveweartofatiguewear．(3)Normalforcehasasignificantimpactonwear．Therealcontactareaisdrovedbynormalforce．Underbrakingconditions，largenormalforceCanleadtospallingmoreeasily．(4)Thespallingofwheelsteelbeginswithtransversesurfacecrackingin西南交通大學(xué)碩士研究生學(xué)位
7、論文第1ll頁reciprocatingrollingtest．(5)Coefficientoffrictionandweararebothdecreasedwiththeexistenceofwater．Keywords：Wheeltreaddamage；Brakingforce；Frequency；Normalforce；Water西南交通大學(xué)四南父逋大罕學(xué)位論文版權(quán)使用授權(quán)書本學(xué)位論文作者完全了解學(xué)校有關(guān)保留、使用學(xué)位論文的規(guī)定，同意學(xué)校保留并向國家有關(guān)部門或機構(gòu)送交論文的復(fù)印件和電子版，允許論文被查閱和借閱。本人授權(quán)西南交通大學(xué)可以將本論文的
