Weld Fatigue Analysis in ANSYS using ANSYS Fatigue Module

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1、WeldFatigueAnalysisinANSYSusingANSYSFatigueModuleAlexanderKiellandplatformaccidentduring1980FatigueAnalysisinANSYSScopeofpresentation•ANSYSfatigueoverview–ANSYSnCodeDesignLife™–FatiguemoduleinANSYSWorkbench–ANSYS(classic)post1FatigueModule–Usercalculatedfatiguecriteri

2、aplottedusingANSYSpost1•WeldfatiguemethodsthatcanberelatedtoWBFatigueModule•Shortnotesonsub-modelingtechnique•LivedemonstrationofcompleteworkflowfromCADtoanalysisresultsusingANSYSWBFatigueModuleANSYS®nCodeDesignLife™IntegratedwithinANSYSWorkbenchenvironmenttoprovideal

3、eadingsolutionforadvancedfatigueanalysis.ANSYSFatigueModule•Stresslifefatigueevaluation•StrainlifefatigueevaluationANSYSpost1FatigueModuleHowANSYSCalculatesFatigue•TheANSYSfatiguecalculationsrelyontheASMEBoilerandPressureVesselCode,SectionIII(andSectionVIII,Division2)

4、forguidelinesonrangecounting,simplifiedelastic-plasticadaptations,andcumulativefatiguesummationbyMiner'srule.Usercalculatedfatiguecriteria•UsercalculatedfatiguecriteriaplottedusingANSYSpost1FatigueassessmentofweldsThereareanumberofmethodsavailableforfatigueassessmento

5、fweldedjoints•Nominalstressmethod•HotSpotmethod(geometricalstresses)•Fracturemechanicsanalysis•EffectiveNotchMethod(notchstresses)–CanbeuseddirectlywithANSYSFatigueModulewhentheappropriatefatiguedataisinputFatigueassessmentofweldsEffectivenotchstressmethod(R1MS)•Thism

6、ethodconsiderthenotchstressesinconcentratedareasandrequirecorrectmodelingofweldseam.TotalstressMembraneBendingNonlinearpeakstress=++FatigueassessmentofweldsEffectivenotchstressmethod(R1MS)•Forusewithsolidmodelsonly•Bothweldrootandweld“toe”isconsidered.•Themethodisappl

7、icableforplatethicknesseslargerthan5mm•Misalignment,skewnessofplatesorothergeometricimperfectionmustbemodeledsinceitisnotinthefatiguestrengthclass.FatigueassessmentofweldsEffectivenotchstressmethod(R1MS)•Aradiusof1mmisintroducedatweldrootorweld“toe”Radius=1mm•Maxofpri

8、ncipalstressesareused,butstressesshouldbeperpendiculartotheweldjoint.•Fatigueevaluationisperformedaccordingtofatiguestrength