DesignLife_Training_nCode9(疲劳)

HBM–nCodeProductsDesignLifeTMTrainingDesignLifeTrainingAgendaI.IntroductiontoDesignLifeII.FundamentalsofFE-basedfatigueanalysisi.Processoverviewii.Loadmappinga.Superpositionb.Timestepc.Dutycyclesiii.UsingFEresultsi.Multiaxialassessmentii.Stresscombinationiii.Stressgradientsiv.Plasticitycorrectionsv.LargemodelsIII.Dynamicsi.Directtransientii.Modalsuperpositioniii.VibrationIV.Weldsi.Seamweldsii.SpotweldsV.VirtualStraingageandCorrelationwithTestVI.IsothermalandThermalMechanicalFatigue3nCodeDesignLife4nCodeProductRangeSTREAMLININGTHECAEDURABILITYPROCESSDATAPROCESSINGSYSTEMFORDURABILITYMAXIMIZINGROIONTESTANDDURABILITY•Complexanalysistoreport,simplydone•Graphical,interactive&powerfulanalysis•Worldleadingfatigueanalysiscapabilities•FatigueanalysistechnologyforFEA•Processencapsulation•Fast,configurable,andscalable•Enablescollaboration,managesdata,andautomatesstandardizedanalysis•Search,queryandreportingthroughsecurewebaccess.•Datatoinformationtodecisions•Stress-Life(single,multi-curve,Haighdiagrams)•Strain-Life(automatedmulti-axialcorrections)•Multi-axialsafetyfactor(DangVan)•Seamweldfatigue•Spotweldfatigue•Adhesivebondsafetyfactor•Hightemperaturefatigue•Creeprupture•CrackGrowth•Short-fibercompositefatigue•Vibrationfatigue(shakersimulation)•Virtualstraingaugesforcorrelation•Animationofstructuraldeformation–CapabilitiesMajorFEcodessupported:•MSCNASTRANop2•NXNASTRANop2•ANSYSrst•AbaqusODB,fil•LS-Dynad3plot•Optistructop2FiniteElementresultssupported:•Static(linearsuperposition)•Transient•Modal•FrequencyResponse•Linear&Non-linearFiniteElementSupport•Primaryapplicationishigh-cyclefatigue(longlives)wherenominalstresscontrolsthefatiguelife.•Materialmodels•StandardSN•SNMeanmulti-curve•SNR-ratiomulti-curve•SNHaighmulti-curve•SNTemperaturemulti-curve•BastenaireSN•Meanstresscorrections•FKMGuidelines•Goodman•Gerber•Stressgradientcorrections•FKMGuidelines•Userdefined•Pythonscriptingcanaddcustommethodsandmaterialmodels.Stress-lifeAnalysis•Applicabletoawiderangeofproblemsincludinglow-cyclefatiguewiththelocalelastic-plasticstraincontrolsthefatiguelife.•DesignLifeprovidesmanyadvancedanalysisoptionsandwaysofdefiningthematerialproperties.•FEresultsinput•Stress•Linearstrain•Stress&Strain•Materialmodels•StandardEN•ENMeanmulti-curve•ENR-ratiomulti-curve•ENTemperaturemulti-curve•Meanstresscorrections•Morrow•SmithWatsonTopper•Interpolate•PlasticityCorrections•Neuber•Hoffman-Seeger•MultiaxialAssessment•Biaxial•3DMultiaxial•Auto-correctionStrain-lifeAnalysis•Methodbasedonthe“Volvo”approach(SAE982311*)andvalidatedthroughyearsofuseonvehiclechassisandbodydevelopmentprojects.•StressescaneitherbetakendirectlyfromFEmodels(shellorsolidelements)orcalculatedfromgridpointforcesordisplacementsattheweld.•Fillet,overlapandlaserwelds•Weldtoeandrootfailure•Thicknesscorrection•Meanstresseffect•Interpolationofmaterialcurvesforbending&tensionSeamWeldFatigue*Forrecentstudycomparingseamweldmethods,seeSAEpaper2011-01-0192•MethodbasedonLBFmethod(SAE950711)•Spotweldsmodelledbystiffbeamelements(e.g.NASTRANCBAR)•Alsosupported–CWELD,ACMformulationsusingsolidelements•Crosssectionalforcesandmomentsareusedtocalculatestructuralstressaroundtheedgeoftheweldspot.•Lifecalculationsaremadearoundspotweldusinglineardamagesummationandreportingworstcase.•PythonforadvancedcustomizationSpotWeldFatigueSpotweld“Nugget”ACMMethodBeamElement•Simulatevibrationtestsdrivenbyrandom(PSD)orswept-sineloading.Predictfatigueinthefrequencydomainusingvirtualshakertesting.•Morerealisticandefficientthantime-domainanalysisforsuchapplications•Includestaticoffsetcase•Considersdutycycles•BasedonestablishedmethodsandmilitarystandardsVibrationFatigueWebinarsavailableformoreinformationComponentsinhightemperatureoperatingenvironmentssuchasenginemanifolds,pistonsandexhaustsystemscansufferfromcomplexfailuremodes.Hightemperaturefatiguemethods:•Chabochemethodisastress-lifeapproachthatcanuseelasticstressesfromFEandeitheraconstantorcycle-by-cycletemperaturecorrection.•ChabocheTransientmethodaccountsfortemperaturebynormalizingthestresshistorypriortocyclecounting.Creepanalysismethods:•Larson-Millerusesamastercreepcurve(pairedX-Ycurveorpolynomialfunction)tocalculatedamagepertimeincrementofappliedload.•Chabochecreepisanon-lineardamagesummationapproachthatusesasetofcreepcurves,whereeachcurveisforaspecifictemperature.Thermo-MechanicalFatigueWebinarsavailableformoreinformation•ShortFiberCompositeoptionusesastress-lifeapproachfortheanalysisofanisotropicmaterialssuchasglassfiberfilledthermoplastics.•ThestresstensorforeachlayerandsectionintegrationpointthroughthethicknessisreadfromFEresults.•Thematerialorientationtensordescribingthe“fibershare”ateachcalculationpointisprovidedbyamanufacturingsimulationmappedtotheFEmodel.•RequiresstandardmaterialsdataoftwoormoreSNcurvesfordifferingfiberorientations,tocalculateanappropriateSNcurveforeachcalculationpointandorientation.ShortFiberCompositeImagecourtesye-XstreamengineeringWebinarsavailableformoreinformationFundamentalsofFE-basedfatigueanalysis20IntegratedDurabilityProcessCAEDurabi