Research On Mechanical Behavior Simulation And Experimental Method Of Radial Tire

Automobile industry has become an important trade in the buliding of our national economy. Tire is one of the important parts of automobile. The mechanics characteristics of tire mainly effect the capabilities of automobile, such as control stability, safety performance, and calm performance. The radial tire is a renovate product of tire industry in our country. It is one of the industrial policies to develop radial tire designedly. Now, there is a superexcellent opportunity to develop our tire industry with speedway rising, automobile rapid development and our country entering WTO. But there are some austere challenges we will be faced. We should investigate the differences between us and other countries and adopt effective means to promote the development of our tire industry.Tire designing gradually realizes automatic design and intelligent design with the development of high capable computer, computational technologies and software. The theory of natural balance contour is used for the contour design. Now, the theory of dynamic construct design, such as rolling control optimization theory, has been developed and used in tire design. In this paper, the finite element analysis (FEA) has been used to analyse the static contact performance, the rolling performance and vibration characteristics of the radial tire by using flexible composite material mechanics, composite visco-elastic theory and tire mechanics. The experiment has also been carried out to study the mechanical performance of the tire material, the load-deflection relationship and dynamic characteristics of tire 195/60R14.The tests of uniaxial tension and cycle loading have been done to study the relations between force and deformation, as well as the ultimate strength of tire rubber materials. The results show that the Young's module of tire materials are different. The Young's module increases rapidly when strain is small strain and then drops gradually. The change of Young's module becomes small under large strain state and the curve of Young's module and strain keeps flat. The difference of ultimate strength of the tire rubber materials is small. Stress relaxation and lag of rubber materials occur in deformation. The lag circles minish and level off gradually with increase of the cycles of load stressing.The nonlinear axisymmetric finite element model has been built to simulateposition on rim, inflation and free rotation of the radial tire. The nonlinearity and incompressibility of rubber material, the anisotropy of cord/ rubber composite, the geometric nonlinearity of large deformation in tire, and the nonlinear boundary conditions in the contact areas between tire and rim were taken into account in the model. The deformation and stress distribution of radial tire under inflation pressure and centrifugal force has been obtained by FEA. Research has also been carried out to discuss the influence of inflation pressure, centrifugal force and cord angle on the deformation and stress distribution of the radial tire.The three-dimensional finite element model has been developed for steady contact tire considering the complexity of tire structure, the nonlinearity of tire material, the geometric nonlinearity due to large deformation, the interference fitting between tire and rim and the nonlinear boundary conditions from tire-rim contact and tire-pavement contact. The rebar model and the Mooney model are used respectively for the cord-rubber composite material and the rubber material. The three-dimensional FEA has been carried out to analyse the contact performance of loaded tire. The result gives the influence of inflation pressure, load and angle on the mechanical performance of tire such as deformation, the relationship between load and deformation, the characteristic of contact area, the stress distribution in contact area of tire, and the cord stress distribution of tire et al. The nonlinear camber state FE model of a radial tire is used to study the stress, strain and deformation fields subjected to normal load and inflation pressure conditions, while...