The Research Of Load Bearing Simulation And Failure Mechanism About Load Vehicle Renovation Tire

With the rapid development of automobile industry, scrap tires producing substantially, the tire renovation has become a way of valuable and environmental recycling technology internationally recognized, and the need of promoting the energy conservation and emission reduction and the green recycling economy developing. However, the renovation tire lacks of systematic research in terms of technology theory, craft and detection, so the renovation tire of brings the destruction and failure of the tread, sidewall, ply, buffer layer and bead delaminating and cracking. The destruction and failure brings about the malfunctions of the tire burst out of control, and the traffic accident of the moving vehicle. This seriously influences the application market of the renovation tire, and the person safety. Basing on the analysis of the load-vehicle renovation tire micromechanics performance, the analysis and test of the micro-temperature field mechanism and test research, and the analysis of the renovation tire load bearing deformation property and the failure mechanism, this dissertation studies the theory of the load-vehicle renovation tire load bearing simulation and the failure mechanism.By studying the performance of the main structure and the interlayer bonding of the renovation tire, this dissertation proposes the laminated structure model of the improving the simulation efficiency of the binary composite of the renovation tire matrix layer rubber and the steel cord, and the ternary composite material of the tread layer, buffer layer and matrix layer. By the micromechanics analysis of the laminated structure and the layer structure mechanical analysis, this dissertation studies the method of the renovation tire structure large deformation.This dissertation establishes the renovation tire computer analysis geometrical model and finite element simulation analysis model. By simulating and testing the load-deformation, stress-strain, ground properties, fatigue properties, tear properties and material properties of the renovation tire under different conditions, the dissertation obtains the load-deformation law of the vertical load, the tangential load, the lateral load and the orthogonal complex, and the dissertation amends the radial deformation formula of the load-vehicle retreaded radial tire, and further researches the micromechanics of the interaction in the tread layer, the buffer layer and the matrix layer, laying the foundation for studying the failure mechanism theory of the renovation tire.The dissertation sets up the finite element analysis model of micro-temperature field distribution subdivision module of the renovation tire laminated structure. By the simulation analysis and the test research, the dissertation achieves the temperature field distribution law and transient heat conduction law under the rolling condition, it further analyzes the micro-temperature field mechanism of different layers and inter layers of the renovation tire and its effect on the applicable property.The dissertation explores the applicable feasibility of the established models, develops the methods to test the material properties of the tread layer, the buffer layer and the matrix layer, such as elastic modulus, and acquires the required parameters. With the achievement of the above, the dissertation establishes the static load deformation test system, the dynamic chassis dynamometer temperature measurement system and the tire friction heat conduction testing system, and explores tire performance tests and effective ways to improve the simulation accuracy of the renovation tire.By the simulation analysis and the testing research of the new renovation tires of the same brand, same type and same specification, this dissertation researches their variation laws of radial stiffness properties respectively, and proposes the prediction method of matrix stiffness life of the renovation tire, which lays a foundation for the remaining factor of safety study and comprehensive performance assessment, prediction, test and study of the renovation tire.It can be achieved about life forecast of the tire carcass in establishing the compound material laminated structure model of load-vehicle retreaded radial tire, the finite element simulation analysis model and testing methods, and in simulating and identifying the used matrix remaining life factor of safety, and in setting up the stiffness coefficient database of the new tire of the same brand, type and specification under the standard load and tire pressure conditions.This dissertation has an important social significance and good social economic benefits in improving the theory of renovation tire, regulating the manufacturing technique of renovation tire, advancing the means of detection of renovation tire properties, ensuring its quality, expanding the market of renovation tire, and promoting the recycling of scrap tire and energy saving and environmental protecting etc..