| Many kinds of important automobile's characteristics are closely related to the performance of tire. However, traditional tire design theories cannot meet design requirements usually, because of complex tire structure and material. In order to improve the quality of tire and meet vehicle requirements, finite element method has become an important tool in the filed of tire design, which is able to reduce the time of design and development. The study is our school's cooperation project with Guangzhou South China Tire & Rubber Co., Ltd. Primary objective is to solve the problems that radial tire's stiffness characteristics cannot meet the application requirements and less type-ground braking friction force.The whole research process is based on in-depth study of radial tire's structure and material properties. For 175/65R14 radical tire, Hypermesh is used to mesh the cross-section of tire, then longitudinal groove pattern tire model and complex tread pattern tire model are constructed respectively by the use of Abaqus software. To truly reflect the properties of tire materials, in this paper, Yeoh model is used to simulate hyperelastic rubber material properties, and Rebar element model is used to simulate rubber-cord composite material properties.Firstly, compare the accuracy and efficiency of longitudinal groove pattern tire model and complex tread pattern tire model in the simulation of stiffness. The conclusion is drawed that tread pattern has little impact on the overall mechanical properties of tire. Thus, in order to improve the speed of solution, longitudinal groove pattern tire model is choosed to analyse all of mechanical properties but the contact behavior between tread patterns and ground.Secondly, considering geometric nonlinearity, the nonlinearity of rubber material, and contact nonlinearity, this paper addresses an effective method to simulate the whole process from rim fitting and tire inflation to load application and obtain the characteristics of radial stiffness, side stiffness, longitudinal stiffness, turnning stiffness and enveloping stiffness. The comparison with test results verifies correctness of the simulative analysis. On this basis, the contact behavior between tread patterns and ground, the load and deformation character of the skeleton and rubber structure, and effect of belt angle on the radial stiffness are analysed. The research results can help to predict five kinds of tire's stiffness and optimize the structure of radical tire.Finally, the adhesion mechanism of tire and road is analysed in this paper. A steady state rolling analysis is performed by using steady state transport in Abaqus/Standard. Considering the effect of inertia, type-ground braking friction force is simulated and analysed, through controlling tire's translational and rotational speed. The relationship between longitudinal friction and slip rate in braking condition, along with the behavior of lateral and longitudinal friction in cornering/braking joint condition are obtained.
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