横滨的新轮胎设计方法学

Tire Design Methodology Based on Safety- Factor to Satisfy Tire Life 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 Simulation Approach to Truck ,rubber part;,The durability of rubber is evaluated by principal strain,（belt layer, carcass layer）,The durability of FRR is evaluated by stress,(Margin of safety),(Safety-Factor),Tire condition under operation: Tire profile growth & rubber aging due to heat build-up 2. It is necessary to take tire profile growth & rubber aging into consideration.,The new design technology considering actual condition, for example,Tire,Simulation Approach to Rubber Product (1),3. Introduction of the Safety Factor concept,Time,OLD,NEW,Dangerous zone,20,Safety Factor,Margin of Safety = Eb / (max) Eb = Breaking strain of rubber (max) = Maximum value of principal strain in tire parts,Simulation Approach to Rubber Product (2),Safety zone,10,Double Inflation Pressure Method,Estimation ：Principal strain of belt edge filler,Deflected,Deflected,Inflated,New model,Remodel,Inflated,Double Inflation Pressure,Tire size：11R22.5 Room temperature：30 Load ：21.4kN A.P. ：700kPa 100km/h8h + 60km/h24h 1set=29,120 km 6set = 174,720km (with shaving tread rubber),What happens to TB tires due to high heat and pressure ?,Profile is changed.!,Growth of Overall Diameter !,What happens to TB tires due to high heat and pressure ?,O.D. growth begins in early stages of tire life. After that , it stabilizes.,The growth of tire under operation,TB tires have following change under operation.,The Growth of Overall Diameter,0,1,2,3,4,5,6,7,0,50000,100000,150000,200000,mileage ( km ),O.D. growth ( mm ),TRANSITION,STABILITY,Overall Diameter ( mm ),Mileage (km), Overall Diameter ： Growth O.D. (low pressure) New tire O.D. ( high pressure),The growth of tire under operation, Outside Diameter ： Growth O.D.(Low Pressure) New Tire O.D. ( High Pressure) Section Width ： Almost non-change,The growth of tire under operation,NEW GROWN-a,Tire growth,Rubber properties,Calculation of principal strain in tire by FEM,Rubber properties,MILEAGE (km),O.D. GROWTH (mm),GROWN-b,GROWN-a,NEW,TB tires have following change under operation,Estimation ： Margin of Safety,The Growth Of Overall Diameter,S - S Curve,FEM Model ：NEW TIRE,1st inflated,Procedure of NEW TIRE simulation NEW TIRE MODEL INFLATED LOADED ANALYSIS,SIZE：11R22.5,RIM：22.57.50 A.P 700KPa,Inflated calculation： 1 time,Simulation of NEW TIRE ( FEM ),Inflated calculation & Inflated calculation ( 2 times ) Double Inflation Pressure Method !,2nd-inflated,RIM：22.57.50 A.P 700KPa,1st-inflated profile =REMODEL,Simulation of GROWN TIRE ( FEM ),Procedure of GROWN TIRE simulation NEW TIRE MODEL INFLATED INFLATED LOADED ANALYSIS,Double Inflation Pressure Method,Calculated profile corresponds to actual profile.,Air Pressure vs. Overall Diameter,Example : Effect of tire profile on durability by FEM,Estimation ：Principal strain of belt edge filler,Loaded,Loaded,Inflated,New model,Remodel,Inflated,Double Inflation Pressure,Example : Effect of tire profile on durability by FEM,Outside surface,Body ply line,SIZE: 11R22.5,New (loaded),Grown (loaded), Contour of strain,Contact area,Example ： Principal strain of belt edge by FEM,Margin of Safety = Eb / (max),Which is the best ? = “ MODEL B ” New design technology applying simulation approach.,Example :Effect of tire profile on durability by FEM,Conclusions,1. Double Inflation Pressure Method was developed as prediction of tire profile under operation. 2. Safety Factor (Margin of Safety) was introduced,which means not only judging durability by principal strain amount itself,but also applying material property (Eb) of tire. 3. New tire design technology was developed applying the above concept through whole tire life. 4. This simulation approach can be applied to other rubber products.,Thank you for your attentions !,