横滨的新轮胎设计方法学.ppt

TireDesignMethodologyBasedonSafety FactortoSatisfyTireLife轮胎设计方法学 主要以安全和使用寿命的因素考虑 此方法同样适用与载重胎和BUS胎SimulationApproachtoTruck BusTireDesignKazuyukiKabeTheYokohamaRubberCO LTD 14thChinaTireTechnologyConference 2006 9 20 Contents目录 1 Introduction简介2 RadialTireConstruction Function Characteristics特征3 FRR CharacteristicsofCord Rubber 4 IntroductionofSafety Factorsforrubberproducts5 SimulationApproachtoDurabilityofRubberProduct6 NumericalExample TruckandBusTire7 Conclusions Introduction PurposeofThisPaper Proposalforthenewdesignmethodconsideringactualconditionofrubberproducts forexampleatire 12R22 5 RadialTireConstruction BeadCore Basicfunctionrequiredofatire1 Load carryingcapacity2 Transmissionofdrivingandbreakingtorque3 Cushioningability4 Road holdingabilityOtherrequirementAndalsoInformationcenterofavehicle CharacteristicsofTire rubber cord largedeformation largestrain incompressibility materialnonlinearity compositestructure viscoelasitcity rollingcontact CharacteristicsofTire RubbermodelintirepartHeterogeneous异型structuremodelforcarbonblackfiledrubber Quasi glassystate Cphase Liquidstate Aphase Crosslinkedrubbermolecules Bphase Carbonblack InteractionbetweenCphases ReinforcemantofElastomers editedbyGerardKraus IntersciencePublishers N Y 1965 Section6 MicroscopyintheStudyofElastomerReinforcementbyPigmentFillers byWilliamM Hess RubberintirepartbyMicroscopyHeterogeneousstructureforcarbonblackfiledrubber Mechanicalpropertiesofcord rubber FromtheabovetableModulusofcord ModulusofrubberBreakingstrainofcord Breakingstrainofrubber IntroductionofSafety Factorsforrubberproducts FRR cord rubberpart Thedurabilityofrubberisevaluatedbyprincipalstrain beltlayer carcasslayer ThedurabilityofFRRisevaluatedbystress Marginofsafety Safety Factor Tireconditionunderoperation Tireprofilegrowth rubberagingduetoheatbuild up2 Itisnecessarytotaketireprofilegrowth rubberagingintoconsideration Thenewdesigntechnologyconsideringactualcondition forexample Tire SimulationApproachtoRubberProduct 1 3 IntroductionoftheSafetyFactorconcept Time OLD NEW Dangerouszone 20 SafetyFactor MarginofSafety Eb max Eb Breakingstrainofrubber max Maximumvalueofprincipalstrainintireparts SimulationApproachtoRubberProduct 2 Safetyzone 10 DoubleInflationPressureMethod Estimation Principalstrainofbeltedgefiller Deflected Deflected Inflated Newmodel Remodel Inflated DoubleInflationPressure Tiresize 11R22 5Roomtemperature 30 Load 21 4kNA P 700kPa100km h 8h 60km h 24h1set 29 120km 6set 174 720km withshavingtreadrubber WhathappenstoTBtiresduetohighheatandpressure Profileischanged GrowthofOverallDiameter WhathappenstoTBtiresduetohighheatandpressure O D growthbeginsinearlystagesoftirelife Afterthat itstabilizes Thegrowthoftireunderoperation TBtireshavefollowingchangeunderoperation TheGrowthofOverallDiameter 0 1 2 3 4 5 6 7 0 50000 100000 150000 200000 mileage km O D growth mm TRANSITION STABILITY OverallDiameter mm Mileage km OverallDiameter GrowthO D lowpressure NewtireO D highpressure Thegrowthoftireunderoperation OutsideDiameter GrowthO D LowPressure NewTireO D HighPressure SectionWidth Almostnon change Thegrowthoftireunderoperation NEWGROWN a Tiregrowth Rubberproperties CalculationofprincipalstrainintirebyFEM Rubberproperties MILEAGE km O D GROWTH mm GROWN b GROWN a NEW TBtireshavefollowingchangeunderoperation Estimation MarginofSafety TheGrowthOfOverallDiameter S SCurve FEMModel NEWTIRE 1stinflated ProcedureofNEWTIREsimulationNEWTIREMODELINFLATEDLOADEDANALYSIS SIZE 11R22 5 RIM 22 5 7 50A P700KPa Inflatedcalculation 1time SimulationofNEWTIRE FEM Inflatedcalculation Inflatedcalculation 2times DoubleInflationPressureMethod 2nd inflated RIM 22 5 7 50A P700KPa 1st inflatedprofile REMODEL SimulationofGROWNTIRE FEM ProcedureofGROWNTIREsimulationNEWTIREMODELINFLATEDINFLATEDLOADEDANALYSIS DoubleInflationPressureMethod Calculatedprofilecorrespondstoactualprofile AirPressurevs OverallDiameter Example EffectoftireprofileondurabilitybyFEM Estimation Principalstrainofbeltedgefiller Loaded Loaded Inflated Newmodel Remodel Inflated DoubleInflationPressure Example EffectoftireprofileondurabilitybyFEM Outsidesurface Bodyplyline SIZE 11R22 5 New loaded Grown loaded Contourofstrain Contactarea Example PrincipalstrainofbeltedgebyFEM MarginofSafety Eb max Whichisthebest MODELB Newdesigntechnologyapplyingsimulationapproach Example EffectoftireprofileondurabilitybyFEM Conclusions 1 DoubleInflationPressureMethodwasdevelopedaspredictionoftireprofileunderoperation 2 SafetyFactor MarginofSafety wasintroduced whichmeansnotonlyjudgingdurabili