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ID:34143454
大小:1.92 MB
页数:9页
时间:2019-03-03
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1、EngineeringFailureAnalysis18(2011)433–441ContentslistsavailableatScienceDirectEngineeringFailureAnalysisjournalhomepage:www.elsevier.com/locate/engfailanalAnalysisoftheaxlefractureofthebucketwheelexcavatora,⇑abaMileSavkovic´,MilomirGašic´,MiodragArsi
2、c´,RadovanPetrovic´aUniversityofKragujevac,FacultyofMechanicalEngineeringKraljevo,Dositejeva19,36000Kraljevo,SerbiabInstituteforTestingMaterialsIMS,BulevarVojvodeMišic´a43,11000Belgrade,SerbiaarticleinfoabstractArticlehistory:Thecommondesignofthebuck
3、etwheeldrivemechanisminsomebucketwheelexcava-Received4May2010tors(BWE)consistsofagearboxandahollowshaft,whilethebucketwheelissupportedbyReceivedinrevisedform27September2010theaxlepassingthroughthehollowshaft.Impropermaintenanceandinadequateelimina-Ac
4、cepted28September2010tionofaxismisalignmentofthehollowshaftandthebucketwheelaxlearethemainAvailableonline27October2010causesofexcavatorfailureandaxlefracture.Thepaperexaminesthecausesofbucketwheelaxlefractures.Keywords:Experimentaltestingofthechemica
5、lcompositionandmechanicalpropertiesoftheBucketwheelexcavatormaterialusedtomakethebucketwheelaxleandmetallographicinspectionsofthefrac-BucketwheelaxleFailureanalysisturesurfacesinthebucketwheelaxlebymeansofelectronicandlightmicroscopecarriedExperiment
6、altestingoutinthefirstpartofthepaperhaveshownthattherearenosignificantinhomogeneitiesanderrorsinthematerialoftheaxle.ThesecondpartofthepaperpresentstheFEManalysisofinfluencesofdisturbancesonthemannerofsupportofthebucketwheelaxleonthefracture.Itshowsthat
7、thenegativeinfluencesofsupportoftheaxlereflectedthroughtheincreaseinthestressconcentrationandoccurenceoftheinitialcrackarethemaincausesoftheaxlefracture.Ó2010ElsevierLtd.Allrightsreserved.1.IntroductionDigginganddepositingoflayersofmaterialsinopenpitmi
8、nesaremostfrequentlyperformedbybucketwheelexcava-tors(BWE).BWESRs2000.32/5.0+VR92(Fig.1a)isusedintheopenpitminein‘‘Kolubara”–Serbia.Aftermorethan40,000hofexploitationoftheBWESRs2000.32/5.0+VR92(Fig.1a)duringaperiodoftenyears,thereoccurredafractureoft
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