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,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：30Load：21.4kNA.P.：700kPa100km/h8h+60km/h24h1set=29,120km6set=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：22.57.50A.P700KPa,Inflatedcalculation：1time,SimulationofNEWTIRE(FEM),Inflatedcalculation&Inflatedcalculation(2times)DoubleInflationPressureMethod!,2nd-inflated,RIM：22.57.50A.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,whichmeansnotonlyjudgingdurabilitybyprincipalstrainamountitself,butalsoapplyingmaterialproperty(Eb)oftire.3