Research On Testing And Simulation Analysis Methods Of Tire Rubber Oxygen Consumption

Tire aging is one of the main causes of tire damage.There are many factors that affect tire aging,such as temperature,oxygen and ultraviolet rays.Among them,the influence of temperature and oxygen is the most critical.The aging caused by these two factors is called thermal oxidative aging,which is mainly evaluated by rubber oxygen consumption.However,due to the insufficient research of rubber oxygen consumption test equipment,it is not possible to accurately measure the oxygen consumption of rubber,which greatly hinders the research progress of tire rubber anti-aging methods.Therefore,the development of rubber oxygen consumption equipment and the evaluation of rubber oxygen consumption simulation analysis methods have important theoretical significance and engineering application value.In order to measure the oxygen consumption of tire rubber,a rubber oxygen consumption test bench was built based on the pressure method.When the rubber consumes oxygen in a closed container,the pressure of the container will drop.By accurately measuring the pressure drop,the rubber oxygen consumption can be estimated.On the one hand,the design of the mechanical structure of the test bench and the selection of the main equipment were carried out.On the other hand,the control system of the test bench was developed to realize the precise control of the pressure change of the closed system and calculate the oxygen consumption of the rubber through the pressure drop.Taking the all-steel radial truck tire(TBR 12.00R22.5)as the research object,the oxygen consumption of tire rubber was tested using the test bench.By analyzing the repeatability of the test results,the rationality of the test results is explained.To shorten the test time of oxygen consumption of rubber at 60℃,based on the principle of timetemperature equivalence,60℃ is selected as the reference temperature,and the oxygen consumption data of rubber at 60℃,70℃ and 80℃ are superimposed.The superimposed results are verified according to the existing data of oxygen consumption at 90℃.Studies have shown that the time it takes for rubber to consume the same quality of oxygen at 60℃ and 90℃ can be calculated using the principle of timetemperature equivalence.When rubber oxygen consumption is tested,the reaction process can be accelerated by increasing the test temperature,thereby shortening the experimental time.To study the simulation method of rubber oxygen consumption,based on the gas diffusion theory and the rubber oxidation reaction mechanism,a rubber oxygen consumption calculation method is developed.The results show that the experimental values and the simulated values are within a reasonable error,which verifies the reliability of the method.According to this method,a finite element model of tire rubber oxygen consumption was established,the oxygen consumption and oxygen concentration distribution of each part of the tire was analyzed.To verify the reliability of tire oxygen consumption simulation analysis model,a tire oven aging test was carried out,and the oxygen pressure changes of the tire were measured.Based on the tire oxygen consumption model,the changes of oxygen pressure with time are analyzed.The results show that the simulation results are in good agreement with the test results,verifying the reliability of the tire oxygen consumption finite element analysis method.