不同法向载荷下轮轨材料滚动摩擦磨损行为分析

《不同法向载荷下轮轨材料滚动摩擦磨损行为分析》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、万方数据西南交通大学硕士研究生学位论文第1I页AbstractWiththerapiddevelopmentofnationalrailwaylineformixedpassengerandfreight，therollingcontactfatigueandwearofwheel—railbecomemoreandmoreserious．Asaresult，enhancinginvestigationontheformationofwheel—railfatigueandwearmechanisms，factorsandpreventingmeasuresofwheel-raildama

2、geCanprovideimportantguidanceforthedevelopmentofheavy-loadandhi曲一speedrailwayandtheproposalofpreventivemeasuresofwheel-raildamage．Inthispaper,damagemechanismofheavyrailwasstudiedbymeansofthemacroandmicroanalysisofheavy—loadraildamagebehavior．Therollingcontactfrictionandwearingpropertiesofthewheel-

3、railmaterialunderdifferentloadswereinvestigatedbyusingaJPM-1Brollingcontactfatiguetestingapparatus．ThefiniteelementsimulationsoftwareABAQUSWasusedtosimulateexperiment．Throughtheabovework，theresultsofpaperwereasfollowing．(1)Theseveredamagesonheavy-haulrailwereshownasfollowing：spallingdamageappeared

4、onthesurfaceofheavy-haulrail，andsidewearWasseeninneroftherail．Thehardnessanalysisofcrosssectionshowedthattheworkinghardeningonthetopandthesidewearregionofthedamagedrailmainlyfocusedonthesurfaceofmaterial．(2)Theseriousplasticdeformationappearedonthetopofthedamagedrail．Themacroscopicobliquecracks，wh

5、osepropagationformWasdominatedbythetransgranulargrowth，werefoundalongthedirectionofplasticflow．Therewereslightplasticdeformationandstrippingdamageonthesidewearregion．AndneitherplasticdeformationnormacroscopicobliquecracksWasfoundonthenoncontactregion．(3)Withtheincreaseoftheload，frictioncoefficient

6、instablerollingfrictionstagewouldincrease．Meanwhile，thewearrateofwheel／railspecimenswouldbeintensified．Accordingtothechangingtrendofwheelrailmaterialshardness，thethicknessofwheel／railplasticdeformationlayerwouldincreasewiththeloadincreasing．(4)Underthesameworkingcondition，thedepthofplasticdeformat

7、ionandthewear万方数据西南交通大学硕士研究生学位论文第1II页massofwheelspecimenwerelargerthanthatofrailspecimenwhencomparedwithrailwheelsspecimensample．Therailandwheelsurfacedamagemorphologyweremanifestedasthetypicalrollingcontactfatig