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1、PERGAMONEngineeringFailureAnalysis5"0888#020030FatiguelifepredictionofthemetalworkofatravellinggantrycraneV[A[KopnovP[O[Box53Ekaterinbur`519096RussiaReceived2April0887^accepted18September0887AbstractIntrinsicfatiguecurvesareappliedtoafatiguelifepredictionprobl
2、emofthemetalworkofatravellinggantrycrane[Acraneusedintheforestindustrywasstudiedinworkingconditionsatalogyardandstrainmeasurementsweremade[Forthecalculationsofthenumberofloadingcyclestherain~owcyclecountingtechniqueisused[Theoperationsofasampleofsuchcraneswereobse
3、rvedforayearfortheaveragenumberofoperationcyclestobeobtained[Thefatiguefailureanalysishasshownthatfailuresofsomeelementsaresystematicinnatureandcannotbeexplainedbyrandomcauses[0888ElsevierScienceLtd[Allrightsreserved[Keywords]Cranes^Fatigueassessment^Straingauging
4、0[IntroductionFatiguefailuresofelementsofthemetalworkoftravellinggantrycranesLT51Bareobservedfrequentlyinoperation[Failuresasfatiguecracksinitiateandpropagateinweldedjointsofthecranebridgeandsupportsinthreefouryears[Suchcranesareusedintheforestindustryatlogyardsf
5、ortransferringfull!lengthandsawnlogstoroadtrainshavingaload!liftingcapacityof21tons[Morethan0999cranesofthistypeworkattheenterprisesoftheRussianforestindustry[Theproblemwasstatedto_ndtheweakestelementslimitingthecranes
6、livespredicttheirfatiguebehaviourandgiverecom
7、mendationstothemanufacturersforenhancingthelivesofthecranes[1[AnalysisofthecraneoperationFortheanalysisatravellinggantrycraneLT51BinstalledatlogyardintheEkaterinburgregionwaschosen[Thecraneservestwosawmillscreatesalogstoreandtransferslogstooroutofroadtrains[Aroadp
8、assesalongthelogstore[Thesawmillsareinstalledsothatthereceptionsitesareunderthecranespan[AschematicviewofthecraneisshowninFig[0[02495296:88:,!seefrontmatter0888ElsevierScienceLtd[Allrightsreserved[PII]S02495296"87#999306021V[A[Kopnov:En`ineerin`FailureAnalysis5
9、"0888#020030Fig[0[Aschematicviewofthecrane[Aseriesofassumptionsmaybemadeafterexaminingtheworkofcranes],ifthemonthlyremovaloflogsfromtheforestexceedsthe
