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1、EngineeringFailureAnalysis18(2011)212–222ContentslistsavailableatScienceDirectEngineeringFailureAnalysisjournalhomepage:www.elsevier.com/locate/engfailanalBucketwheelexcavator:Integrityassessmentofthebucketwheelboomtie-rodweldedjointSrdanM.Bošnjak-a,MiodragA.Arsic´b,NenadÐ.Zrnic´a,⇑,
2、MarkoP.Rakinc,MiloradP.Pantelic´daUniversityofBelgrade,FacultyofMechanicalEngineering,KraljiceMarije16,11120Belgrade35,SerbiabInstituteforTestingMaterials,BulevarvojvodeMišic´a43,11000Belgrade,SerbiacUniversityofBelgrade,FacultyofTechnologyandMetallurgy,Karnegijeva4,11120Belgrade35,S
3、erbiadKolubaraMetalLtd.,DišeÐurdevic-´aRusa32,11560Vreoci,SerbiaarticleinfoabstractArticlehistory:Thebucketwheelboomtie-rodsarevitalstructuralpartsofthebucketwheelexcavatorsReceived16March2010(BWE).TheirfailuresinevitablycauseBWEcollapseandarefollowed,amongotherthings,Receivedinrevis
4、edform2September2010byasubstantialfinancialloss(millionsof€).Non-destructivetestingrevealedaflawintheAccepted5September2010buttweldedjointofthebodyandeye-plateofthebucketwheeltie-rod.ItssizeexceedstheAvailableonline15September2010levelallowedbycurrenttechnicalregulations.Anintegrityass
5、essmentofthebucketwheeltie-rodhasbeencarriedout,i.e.theremainingfatiguelifehasbeendeterminedbasedonKeywords:thestress-statecharacteristicsintheweldedjointanddefinedbyexperimentalresearchBucketwheelboomtie-rodinrealworkingconditions.ThecalculationresultsshowthatdespitetheexcessivesizeN
6、on-destructivetestingWeldedjointoftheinternalflawtheweldedjointintegrityisnotcompromised.DuringperiodicalFatigueinspectionsoftheweldedjointinthepasttwoyears(BWEwasputintooperationinStructuralintegrityDecember2007)changesthatcouldcompromisethestructuralintegritywerenotobserved.Inthiswa
7、y,byusinga‘‘fail-safe”philosophydesign,aconsiderablefinancialsav-ing(ca.1,600,000€)wasachievedwhileatthesametimetherewasnothreattothework-er’ssafetyandlife,thesafetyofthemachineandtheproductionprocessintheopenpitmine.Ó2010ElsevierLtd.Allrightsreserved.1.IntroductionBucketwheelexcavato
8、rs(BWE),Fig.
