| In this paper,the finite element analysis software ABAQUS is used to study 12R22.5 radial truck tire.Firstly,through the analysis of tire mechanical deformation,the establishment of viscoelastic loss model and heat generation model,the si mulation analysis of tire steady rolling heat generation temperature field is realized,and the tire temperature field distribution is obtained.Then,taking plastic steel window sealing strip as an example,the aging experiment of ethylene propylene rubber samples is performed.The mathematical model of aging life prediction is established to predict the service life of the sealing strip,and the mechanical analysis of the sealing strip under different aging conditions is carried out.Finally,the thermal oxygen aging gas diffusion and inflation pressure loss models under different temperatures are established to simulate the inflation pressure loss of tires under different loads.Firstly,the finite element model of 12 R22.5 TBR tire is established,and the predicted values of the tire under the given inflation pressure and load are in good agreement with the measured values,thus verifying the reliability and accuracy of the mechanical model.The implicit algorithm in ABAQUS is used to realize the steady rolling of the tire.The dynamic mechanical loss model of the tire is established based on the data of the dynamic mechanical property test of the rubbers and the stress and strain data under the dynamic condition of the tire.The predicted temperature field of the tire during the steady rolling process is realized.When driving at the speed of 100 km/h under the standard inflation pressure,by changing the tire load,the high temperature area of the tire temperature field is mainly focused on the shoulder,tread and triangular rubber area,and the position of the highest temperature gradually transfers from the middle of the tread to the shoulder with the increase of the load.When the tire load is lower than the standard load,the maximum temperature of the tire is located in the middle of the tread;when the tire load is higher than the standard value,the maximum temperature is transferred to the shoulder.The transient temperature predicted model of tire in steady rolling state is established.When the tire is driven for about 2 hours,the temperature field in the tire reaches the highest level,and the temperature field is in equilibrium.Based on the aging test of ethylene propylene rubber,the aging life prediction model of plastic steel window seal was established.When the environment temperature of plastic steel window seal is 35 ? and the critical value of aging degree is 0.7,the service life of rubber is 68.73 years.The finite element analysis of the rubber seal under different aging times shows that the static stiffness is different for different aging times.With the increase of aging time,the static stiffness increases gradually and the hardness increases,resulting in the decrease of its elastic deformation,the deterioration of its sealing performance,and the decline of its service performance with the increase of aging time.The diffusion process of oxygen in rubber was visualized,and the oxygen concentration was obtained when the oxygen diffusion reached steady state,in which the gas concentration in the innerline was the largest,which indicated that the innerline played an important role in maintaining the air pressure of tire.The inflation pressure loss under standard inflation pressure of the tire is simulated.When the tire is inflated to the standard pressure,the monthly inflation pressure loss rate R value of tire is 1.53%.In addition,the influence of different time and loads on the tire inflation pressure loss is also investigated when the tire reaches 100 km/h steady rolling speed.It is found that the inflation pressure loss is significantly higher than that when the tire is stationary,and with the increase of load,the internal temperature of the tire is higher and the air tightness of the tire becomes worse. |
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