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TireDesignMethodologyBasedonSafety-FactortoSatisfyTireLife輪胎設(shè)計(jì)方法學(xué)(主要以安全和使用壽命的因素考慮),此方法同樣適用與載重胎和BUS胎
SimulationApproachtoTruck&BusTireDesign
KazuyukiKabeTheYokohamaRubberCO.,LTD14thChinaTireTechnologyConference2006.9.20Contents目錄1.Introduction
簡(jiǎn)介2.RadialTireConstruction,Function&Characteristics特征3.FRR(CharacteristicsofCord&Rubber)4.IntroductionofSafety-Factorsforrubberproducts5.SimulationApproachtoDurabilityofRubberProduct6.NumericalExample:TruckandBusTire7.ConclusionsIntroductionPurposeofThisPaper:Proposalforthenewdesignmethodconsideringactualconditionofrubberproducts,forexampleatire35℃Pressure(kPa)TimeTimeTemperature(℃)InternalAirTemperatureAirPressure100kPa<TIRESIZE>12R22.5Basicfunctionrequiredofatire1)Load-carryingcapacity2)Transmissionofdrivingandbreakingtorque3)Cushioningability4)Road-holdingabilityOtherrequirementAndalsoInformationcenterofavehicle
RubberCordFRRBiaslaminateBiasplyCharacteristicsofTireΩσrubberεεσcordlargedeformation&largestrainincompressibilitymaterialnonlinearitycompositestructureviscoelasitcityrollingcontactCharacteristicsofTire
RubbermodelintirepartHeterogeneous異型
structuremodelforcarbonblackfiledrubber
Quasi-glassystate(Cphase)Liquidstate(Aphase)Crosslinkedrubbermolecules(Bphase)CarbonblackInteractionbetween
CphasesMechanicalpropertiesofcord&rubber
Fromtheabovetable
Modulusofcord?ModulusofrubberBreakingstrainofcord?Breakingstrainofrubber
IntroductionofSafety-FactorsforrubberproductsFRR(cord);rubberpart;
Thedurabilityofrubberisevaluatedbyprincipalstrain(beltlayer,carcasslayer)ThedurabilityofFRRisevaluatedbystress(Marginofsafety)(Safety-Factor)Tireconditionunderoperation: Tirepro&rubberagingduetoheatbuild-up2.Itisnecessarytotaketirepro&rubberaging intoconsideration.
Thenewdesigntechnologyconsideringactualcondition,for
example,Tire
SimulationApproachtoRubberProduct(1)NEWGROWNSTRESS(Mpa)STRAIN(%)EbS-SCurveMILEAGE(km)O.D.GROWTH(mm)NEWGROWNTheGrowthofOverallDiameterGrowthoftire:DoubleInflationPressureMethod
DoubleInflationPressureMethod
<NEWTIRE>Estimation:PrincipalstrainofbeltedgefillerDeflectedDeflectedInflatedNewmodelRemodel<GROWNTIRE>InflatedDoubleInflationPressureTiresize:11R22.5<Testcondition>Roomtemperature:30℃Load:21.4kNA.P.:700kPa100km/h×8h+60km/h×24h1set=29,120km×6set=174,720km(withshavingtreadrubber)WhathappenstoTBtiresduetohighheatandpressure?Prochanged.!!NEWGROWN1SET29,120km3SET87,360km5SET145,600km2SET58,240km4SET116,480km6SET174,720kmGrowthofOverallDiameter!WhathappenstoTBtiresduetohighheatandpressure?<Thegrowthoftireunderoperation.>OverallDiameter:GrowthO.D.(lowpressure)≒NewtireO.D.(highpressure)Thegrowthoftireunderoperation
TIREGROWTHOverallDiameter(mm)AirPressure(kPa)AirPressurevs.OverallDiameter(11R22.5)New(actualtire)Grown(actualtire)<Thegrowthoftireunderoperation.>OutsideDiameter:GrowthO.D.(LowPressure)≒NewTireO.D.(HighPressure)SectionWidth:Almostnon-changeAirPressurevs.SectionWidth(11R22.5)SectionWidth(mm)AirPressure(kPa)Thegrowthoftireunderoperation
New(actualtire)Grown(actualtire)NEWGROWN--aTiregrowthRubberpropertiesCalculationofprincipalstrainintirebyFEMRubberpropertiesMILEAGE(km)O.D.GROWTH(mm)GROWN--bGROWN--aNEWTBtireshavefollowingchangeunderoperationEstimation:MarginofSafetyTheGrowthOfOverallDiameterS-SCurveInflatedcalculation&Inflatedcalculation(2times)DoubleInflationPressureMethod!2nd-inflatedActual(GROWN)RIM:22.5×7.50A.P700KPa1st-inflatedprofile=REMODELSimulationofGROWNTIRE(FEM)Procedureof
GROWN
TIREsimulationNEWTIREMODEL
INFLATED
INFLATED
LOADEDANALYSISDoubleInflationPressureMethodActual(GROWN)Calculatedprotoactualprofile.AirPressurevs.OverallDiameterOverallDiameter(mm)AirPressurevs.TireOverallDiameterNew(actual)Grown(actual)New(calculation)Grown(calculation)NEWGROWNAirPressure(KPa)MODELAMODELBMODELCExample:EffectoftireprodurabilitybyFEMOutsidesurfaceBodyplylineSIZE
:11R22.5New(loaded)Grown(loaded)<Beltedgefiller>Contourof
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