橫濱的新輪胎設(shè)計方法學(xué)課件

TireDesignMethodologyBasedonSafety-FactortoSatisfyTireLife輪胎設(shè)計方法學(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