How-to-Collect-Material-Data(sysweld軟件中材料性能含義及如何收集數(shù)據(jù))

Sysweld

Howtocollectdataforweldingsimulation?

ContentsIntroductionListofDataneededforweldingsimulationonsteel?HowtocollectMaterialDBByUsingSYSWELDMaterialDBByPerformingExperimentalTestsDilatometertestsTensileTestsCreepTeetsOthers….IntroductionThermal,MetallurgicalandMechanicalCharacteristicsToFindthesedata3possibilitiesareoffered:UsetheSYSWELDMaterialDataBaseFindtheseDatainthebibliographyPerformexperimentalteststocharacterizeallthesethermal,metallurgicalandmechanicalDataSysweld

ListofneededdataforweldingsimulationMaterialPropertiesforSteel-f(T,z)Thermalpropertiesinfunctionoftemperature(T°c)andaccordingtotheconsideredphases(zi)Thermalconductivity: =f(T°c,zi)Density: =f(T°c,zi)Specificheat: Cp=f(T°c,zi)Enthalpy: H=f(T°c,zi)LatentHeatEffect: H=f(T°c,zi)MetallurgicalKineticsofTransformationfordifferentspeedofheatingandcoolingAusteniticTransformation: Z=f(T°c,dT/dt)FerriteTransformation: Zf=f(T°c,dT/dt)BainiteTransformation: Zb=

f(T°c,dT/dt)MartensiteTransformation: Zm=

f(T°c)MaterialProperties-f(T,z)Mechanicalpropertiesinfunctionoftemperature(T°c)andaccordingtotheconsideredphases(zi)Young’smodulus: E=f(T°c,zi)Poissoncoefficient: =f(T°c,zi)Thermalstrains:

th=f(T°c,zi)Volumevariationduetometallurgicaltransformations: V/V=cstYieldstress: =f(T°c,zi)Strainhardening: h=f(T°c,zi)Viscousparameter(optionalforviscoplasticsimulation)HardeningCoefficient: K=f(T°c,zi)HardeningExponent: m=f(T°c,zi)StrainRateSensivityExponent: n=f(T°c,zi)Sysweld

Howtocollectthesedata?SysweldMaterialDBByusingtheSYSWELDMaterialDataBaseThisdatabaseCoversthemaincommercialsteelsandaluminumsforweldingandheattreatmentContainsallThermal,MetallurgicalandMechanicalcharacteristicsHasbeenoptimizedtoavoidcumbersomecomputationsduetonumericalreasonsTheadjustmentofthisdatabasewithrespecttogoodresultsandnumericalperformancecoversdecadesofexperience.TheMaterialdatacomesfromanyinstallationHowtofindtheMaterialDBinSYSWELDSeeContentandChooseyourBD.matWeldingBD.matH.TBD.matContentsofthematerialdatabaseTheredmarketmaterialcomeswithanyinstallationContentsofthematerialdatabaseTheredmarketmaterialcomeswithanyinstallationYourProperMaterialDataBaseByperformingexperimentaltestsDilatometrictestsKineticsofTransformationsThermalStrainVolumevariationduestometallurgicaltransformationTractionand/orCompressionTestsYoungModulusStrainHardeningYieldStressRelaxationandCreepTestsViscousParametersOtherTestsConductivityCapacity,Enthalpy,LatentHeatEffectDilatometerDevice:INSAofLyonFranceJouleeffectLoadsensorGasarrivedSpecimenThermocouplesHydraulicjackUsefulZone:,:homogeneousThedilatometermustallowamechanicalloadingandathermalloadingtobesuperimposedDilatometerINSAofLyonFrance

CharacteristicHeatingisprovidedbytheJouleeffect.Therateoftemperaturecanreach100°C/s.Itispossibletoheatuptotemperatureshigherthan1,100°C.Atlowcoolingrates,aheatinputbytheJouleeffectisnecessary.Athighercoolingrates,thespecimensarecooledbyaflowofnitrogeninside.Thesetwosystemsallowcoolingratesrangingfrom–0.1°C/sto–15°C/s.Thetemperaturemeasurementsaretakeninaquiteprecisezone,calledtheusefulzone,

wheretheheatgradientisminimum(usefulzone:thezonewherethestressesandthetemperaturesarehomogeneous).

ExperimentalDilatometricCurvesExperimentalDilatometricCurve:16MnD5SteelThermalStrain:AusteniteTransformationMartensiteTransformationFAPTemperature(°C)Strain(%)SpeedofHeating:80°C/sSpeedofCooling:15°C/sExperimentalDilatometricCurvesExperimentalDilatometricCurve:16MnD5SteelKineticsofTransformation:MartensiteTransformationMartensiteTransformationSpeedofCooling15°C/sStartingTimeEndTimeExperimentalDilatometricCurvesExperimentalDilatometricCurve:16MnD5SteelKineticsofTransformation:MartensiteTransformationBainiteTransformationSpeedofCooling0,3°C/sStartTimeEndTimeExperimentalDilatometricCurvesExperimentalDilatometricCurve:16MnD5SteelKineticsofTransformation:BainiteandMartensititeBainiteTransformationMartensiteTransformationSpeedofHeating:80°C/sSpeedofCooling:5°C/sExperimentalDilatometricCurvesExperimentalDilatometricCurve:16MnD5SteelKineticsofTransformation:BainiteandMartensititeBainite&MartensiteTransformationSpeedofCooling5°C/sBainiteStartTimeMartensiteEndTimeMartensiteStartTimeBainiteEndTimeExperimentalDilatometricCurvesWithalltheseCurves,theCCTDiagramCanbeEstablishedSpeedofcoolingO,O5°C/sO,1°C/sO,15°C/sO,2°C/sO,3°C/sO,5°C/s1°C/s1,5°C/s2°C/s3°C/s4°C/s5°C/s10°C/s15°C/s….100°C/s400°C/sExperimentalTensileCurvesExperimentalTensileCurve:16MnD5SteelForFerrite,Bainite,MartensitePhasesTo=20°C200°C,400°C,500°C,550°C,600°C,650°C….<Ac10'00-VdéfVdéfAVdéfCDotBToEe-eotTemperatureStrainTimeTimeThermalLaodingMechanicalLaodingExperimentalTensileCurvesExperimentalTensileCurve:16MnD5SteelExampleMartensite:T=500°C-1000-50005001000-1,2-0,600,61,21,8Strain[%]Stress[MPa]EStrainHardening

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0.2ExperimentalTensileCurvesExperimentalTensileCurve:16MnD5SteelForAustenitePhase0'0-e0-VdéfVdéfAVdéfCDBTo1100EtootTo=TstartFerrite>710°C800°C,900°C,1000°C,1100°CeTemperatureStrainThermalLaodingMechanicalLaodingTimeTimeExperimentalTensileCurvesExperimentalTensileCurve:16MnD5SteelResultsBainiteandAusteniteYieldStressesExperimentalData00Temperature(°C)YieldStresses(Mpa)

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0,2%BainiteAusteniteExperimentalTensileCurvesExperimentalTensileCurve:16MnD5SteelResultsMartensiteandAusteniteYieldStresses:ExperimentalData00Temperature(°C)YieldStresses(Mpa)AusteniteMartensite

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nlExperimentalCreepTestsCreeptestdefinition.Uni-axialcreeptestshavetobeperformedatconstanttemperatureandatconstantstrengthwithadilatometricdeviceallowingforsimultaneousthermalandmechanicalmeasurements.I Primarycreep: DecreaseofspeedcreepII Secondarycreep:ConstantspeedcreepIII Tertiarycreep: IncreaseofspeedcreepwithdamagingI

IIIII

I

II

IIIExperimentalCreepTestsHowtogettheviscoplasticparameterswithcreeptests?Ateachimposedtemperature,morethanthreecreeptestswithdifferentappliedstressesneedtobeusedtodetermineparameters.ThisfiguregivesanexampleoftheexperimentalresultsobtainedforausteniteatT=1000°C.ExperimentalCreepTestsThefirststepisthedeterminationoftheaveragevalueofM/(M+N)exponent.Inuni-dimensional,eachphasesobeythefollowingviscoplasticlaw:Theelasticlimitinviscoplasticityisgenerallynullathightemperature.Thisflowlawcanbeexplicitlyintegratedatconstantimposedstress:Byplottingonbi-logarithmicgraphtheprimarycreeppoints,youcanobtaintheaveragevalueofM/N+Mcoefficient.ExperimentalCreepTestsIndeedExperimentalCreepTestsActuallytheM/(M+N)exponentisjusttheaverageslopeaswecanseeonthisfigure.Forthisexample:M/(M+N)=(0.6492+0.701+0.8431)/3=0.7311ExperimentalCreepTestsAfterthatweneedstoreport,onbi-logarithmicgraphandfor

differentstresslevels, asfunctionof

Indeed:ExperimentalCreepTestsActuallythe(M+N)/(MN)exponentisjusttheslopeaswecanseeonthisfigure:Forthisexample:(M+N)/(MN)=0.2284ExperimentalCreepTestsActuallythe(M+N)/(MN)exponentisjusttheslopeaswecanseeonthisfigure:Forthisexample:(M+N)/(MN)=0.2284ExperimentalCreepTestsKnowingM/(M+N)andM+N/MN,it’shelpfultodeterminateMandN:Then,itjustsufficestodeterminatetheaveragevalueofKexponentwithallexperimentaltestsatconstanttemperature.Soyouhaveyourthreeviscousparameters:HardeningCoefficient: K=f(T°c,zi)HardeningExponent: m=f(T°c,zi)StrainRateSensivityExponent: n=f(T°c,zi)ExperimentalCreepTestsThelastStepistocheckthevalidityoftheparametersbycomparisonbetweenexperimentalcurvesandsimulatedonesOtherTests:CapacityandEnthalpyTh