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ID:43390105
大小:584.80 KB
页数:17页
时间:2019-10-02
《垂直短裂纹论文-英文》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、本文通过模拟试验揭示了轧馄接触疲劳过程垂直短裂纹的形成机制,具有明显的学术创新性,对于指导支承辘使用有一定价值,文章结构严谨、文理通顺,未汕露企业技术秘密。全文篇幅太长,一些文献引述、笫3节结果为讨论、参考文献可适当删减。VerticalShort-CrackBehaviorandItsApplicationinRollingContactFatigueChanganWangHSMP,BaoshanIronandSteelCompany,Shanghai200941,ChinaABSTRACTTheverticalshort-crackbehaviorpresentedinrollingcon
2、tactfatigueofmediumcarbonbainiticsteelback-uprollundertheconditionsoflowcontactpressure,waterlubricationandpurerollingwerestudied・Theinitiationandpropagationbehaviorofverticalshort-crackweretracedbymicroscopicobservationduetoitsobservabilityonthesurfaceofthespecimen・11isfoundthataftertheshort-cracki
3、nitiatesandquicklypropagatestoacertaindepthfromthecontactsurface,theverticalshort-crackwillstoppropagatingforalargenumberofcycles(from104to3〜5x10、cycles);however,whilethenumberofcyclesisuptotheinitiationlifeofrollingcontactfatigue(about3〜5x10、cycles),theverticalshort-crackre-propagatesatahighpropaga
4、tionrateandalongthecircumferentialdirectionofthespecimenandparalleltothecontactsurface.Basedontheobservedun・propagatingandrc-propagatingbehaviorsofverticalshort-crack,theinitiationlifeandsurfacedistresslifeofrollingcontactfatigueoftheback-uprollerwasmeasured,andthen,themechanismofrollingcontactfatig
5、uewasdiscussed.KEYWORDS:rollingcontactfatigue;verticalshort-crack;initiationlife;bainiticsteel1.IntroductionRollingcontactfatigue(RCF)isamainfailuremodeofrollerandwheel-rail,anditresultsinpittingandspallingoncontactsurface.Duringthehotrolling,thepittingandspallingformedonthesurfaceofrollercandegrade
6、thequalityofmanufacturedsteelsheetgreatly,andtheymustbepreventedinpractice・Inhot-rollingfactory,thefatiguefailureonthesurfaceofrollerispreventedbygrindingthesurfaceawayaftercertainworkingtimeandwithcertainthickness,however,atpresenttheabrasivethicknessadoptedineachgrindingistoolarge,andthenresultsin
7、asignificantlydecreasingintheutilizedlifeoftherolle匚Itimpliesthattheabrasivethicknesscanbefurtheroptimizedonthebasisoftheaccurateunderstandtotherollingcontactfatigue(RCF)behavioroftheroller.Sincethero
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