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1、InternationalJournalofFatigueInternationalJournalofFatigue29(2007)1546–1553www.elsevier.com/locate/ijfatigueFatigueanalysisofspotweldsusingamesh-insensitivestructuralstressapproacha,*bbHongTaeKang,PingshaDong,J.K.HongaDepartmentofMechanicalEngineering,TheUnivers
2、ityofMichigan-Dearborn,4901EvergreenRoad,Dearborn,MI48128-1491,UnitedStatesbCenterforWeldedStructuresResearch,BattelleMemorialInstitute,505KingAvenue,Columbus,OH43201-2693,UnitedStatesReceived6August2005;receivedinrevisedform3June2006;accepted1October2006Availab
3、leonline5December2006AbstractThispaperdescribestheapplicationproceduresofanodalforcebasedmesh-insensitivestructuralstressparameterforanalysisofacomprehensivesetofspotweldfatiguetestdatacollectedfromaseriesofadvancedhighstrengthsheetsteels.Thestructuralstresspara
4、meteriscalculatedinanequilibriumsenseintermsofbendingandmembranecomponentsfromnodalforcesandmomentsateachgridpointalongtheperipheryofaweldnugget.Basedonfracturemechanicsconsiderations,anequivalentstructuralstressparameteristhenusedtotakeintoaccounttheeffectsofloa
5、dingmodeandsheetthicknessonthefatigueofspotweldedjoints.Theequivalentstruc-turalstressisproveneffectiveinconsolidatingthelargeamountoffatiguedataofspotweldsfortransformationinducedplasticity(TRIP),dual-phase(DP),andhighstrengthlowalloy(HSLA)steelssubjectedtobotht
6、ensileshearandcoachpeelloadings.Asaresult,asinglemasterS–Ncanbeestablishedforfatiguedesignandlifepredictionofspot-weldedstructures.Ó2006ElsevierLtd.Allrightsreserved.Keywords:Structuralstress;Fatiguelife;Spotweld;TRIP;Dual-phasesteel1.IntroductionSomeresearchers
7、[2–5]havestudiedontheeffectsofgeometricfactorssuchasnuggetdiameter,sheetthickness,Spotweldingisawidelyemployedtechniquetojoinspecimenwidth,andbasemetalpropertiesonthefatiguesheetsteelsforbodyandcapstructureintheautomotivebehaviorofspotwelds.Theyhavealsostudiedont
8、heindustry.Thestrengthofthespotweldsintheunibodyeffectsofloadingconditionswithdifferentspecimentypesvehiclestructuredeterminestheintegrityofstructuralper-suchastensiles
