垂直短裂纹论文－英文

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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