Durability Analysis And Optimization Of Tire Under Compound Working Conditions

Tire is the only stressed component when the vehicle interacts with the road surface.With the increase of vehicle ownership,the consumption of tire increases.The environmental pollution and resource waste caused by tire consumption have attracted much attention.Therefore,tire durability has become the focus of research.To improve tire durability,it is not only necessary to improve the wear resistance of the tread,but also to reduce the fatigue damage inside the tire,and the tire needs to face a variety of complex working conditions in the actual operation process.However,the research on the comprehensive improvement of tire wear resistance and fatigue resistance under the comprehensive effect of multiple working conditions is rarely involved.Therefore,this paper analyzes the influence of the overall structural parameters of the tire and the structural parameters of the tread pattern on the wear resistance and fatigue resistance under the compound working conditions,and optimizes the design of the structural parameters,providing design ideas and theoretical basis for the development of high durability tires.Taking 205/55 R16 tire as the research carrier,the tire simulation model is established by finite element technology,and the grounding pressure test is conducted on the test sample tire using the electronic pressure tester,and its stiffness is calculated.The test results are compared with the simulation results to verify the accuracy of the model.According to the nine working conditions of the tire,the tire simulation model under each working condition is established,and the evaluation index of wear resistance and fatigue resistance of the tire under the compound working condition is proposed.Based on the above theoretical analysis and simulation model,the durability of the tire under compound working conditions is analyzed.Select 9 tire structural parameters from the tire crown grounding profile structure,belt layer structure,and sidewall area structure,and conduct experimental design using orthogonal test methods to analyze the impact of tire structural parameters on durability under compound working conditions.SPSS correlation analysis was used to screen the structural parameters that were significantly related to the wear resistance and fatigue resistance of the tire.The study found that the crown arc width,crown arc height,and belt width ratio were significantly related to the friction energy loss rate under the compound working conditions,the crown arc height,the belt width ratio and the apex height are significantly related to the strain energy density amplitude under the compound working conditions.Further,through the control variable or single factor analysis method,the influence law of the above four parameters on tire durability is explored from the angle of grounding characteristic parameters.The response surface method is used to optimize the four structural parameters with the two performance indicators under the compound working conditions as the optimization objectives.The results show that the wear resistance and fatigue resistance of the optimized scheme are improved by 2.29% and 11.45% under the compound working conditions,and the amphoteric energy is improved to different degrees under the nine working conditions.The optimization scheme effectively improves the wear and fatigue resistance of the tire,and increases the service life of the tire.The design of tread pattern structural parameters is also an important part of tire durability research.The wear resistance and fatigue resistance of five common tread pattern tires of tires under compound working conditions were compared.The No.5 tire with better amphoteric performance was selected to further explore the effect of pattern structure parameters on durability.Due to the small impact of changes in pattern structure parameters on fatigue resistance,only the wear resistance of tires with complex patterns is studied.Taking the friction energy loss rate under compound working conditions as the optimization objective,the structural parameters of the pattern are optimized.Compared to the sample tire,the optimization rate of wear resistance of the optimized scheme is 3.82% under the compound working conditions,and the optimization rate under the nine working conditions is above 3.00%,realizing the improvement of tire wear resistance.