车轮钢滚动磨损与摩擦特性研究

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1、西南交通大学硕士学位论文车轮钢滚动磨损与摩擦特性研究姓名：王蕴华申请学位级别：硕士专业：机械设计及理论指导教师：郭俊20090401西南交通大学硕士研究生学位论文第ll页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西南交通大学硕士研究生学位

7、论文第1ll页reciprocatingrollingtest．(5)Coefficientoffrictionandweararebothdecreasedwiththeexistenceofwater．Keywords：Wheeltreaddamage；Brakingforce；Frequency；Normalforce；Water西南交通大学四南父逋大罕学位论文版权使用授权书本学位论文作者完全了解学校有关保留、使用学位论文的规定，同意学校保留并向国家有关部门或机构送交论文的复印件和电子版，允许论文被查阅和借阅。本人授权西南交通大学可以将本论文的