Fatigue Life Prediction And Structure Optimization Research Of Radial Tire

As the only part of the car that contacts with the ground,the tire plays a crucial role in the safety of vehicle driving.As a composite material structure composed of cord and rubber,it has typical fatigue failure characteristics.Fatigue failure in the tire bead is one of the main fatigue failure forms,which has been widely concerned in tire industry.Currently,the research for the fatigue life of tire bead relies mainly on the test method.However,experimental method is time-consuming,which seriously affect the efficiency of research development.How to accurately,simply and effectively predict the fatigue life of tire bead is an urgent problem to be solved.In this paper,the fatigue life of a radial tire is predicted by rubber compound fatigue test and finite element method,and the structure of the tire is optimized.The free rolling finite element model of tire is established based on Abaqus.By radial stiffness experiment,the validity of the proposed model is verified.The maximum strain energy density range ΔSEDmax is taken as the parameter for tire fatigue life evaluation.And the maximum strain energy density range of tire bead compound under certain working conditions is calculated by using the finite element model.On the basis of uniaxial tensile fatigue test of bead rubber compound,the fatigue life equations based on the maximum strain energy density range of each rubber material are determined.Combined with the results of finite element analysis,the bead fatigue life of the tire is predicted and compared with the tire fatigue test results,which proves that the prediction method is accurate and rational.Taking maximum strain energy density range as the design response and the structural parameters of tire bead as the design variables,the relationship between the bead fatigue life and the bead structural parameters is established.On the basis of the sensitivity analysis results,reasonable parameters of bead structure are selected for structural optimization.The Kriging approximation model and simulated annealing optimization algorithm are used to optimize the design of the tire bead structure,and the optimization scheme is put forward.The comprehensive performance of the optimization scheme is analyzed based on the finite element analysis method.The durability test verifies the effectiveness of the structure optimization scheme,and also proves the rationality of the life prediction method used in this paper.To sum up,based on the maximum strain energy density range,a more reasonable tire bead fatigue life prediction method is researched in this paper,which can effectively predict the fatigue life of the tire bead and other key components of the tire,significantly improve the efficiency of tire fatigue life research,and has high practicability.