Research On Fields Of Force And Temperature Of Tire By Using Adina

With the development of automobile industries, the automobile speed has increased greatly. But the side effects come after, for example, more tires are damaged in the manner of separation and blowout on the highways. Therefore, it is important to know the force and temperature characteristics of tire for tire design and preventing tire burst. This article did some simulations of force field and temperature field by using ADINA.The tire is made of rubber and cord-rubber composite, it is an integrated complex structure with various nonlinear (including material, geometry and boundary contacting). It is necessary to get thermodynamics properties of rubber for simulating force field and temperature field of tire.The relationship between stress and strain of tire was obtained by the single-oriented tension experiment. The material parameters of three kinds of model were calculated with the help of ADINA. By comparing them, Ogden model was the best one to describe the rubber. The ullage gene curves of seven rubber materials used in tires with the changes of temperature have been obtained by using Dynamic Mechanics Analysis technique (DMA) on NETZSCH DMA242. These parameters provide base for simulate force field and temperature field.The thermal properties of seven types of rubber of tire are measured in this paper by using the laser light instrument of LFA447. The linear relations of thermal conductivity and specific heat of rubber on temperature were obtained by the regression analysis, which are used to forecast the thermal properties of rubber. It also provides the basic data for the numerical simulation of unsteady temperature field of tire.With rational supposition, the finite element model is provided and the initial condition and boundary condition are given. Force field was studied in the article. The curve of distributed contact force, which along the direction of axis(from tread to shoulder), is just like a saddle. The friction stress distribution of contact section in landscape orientation reachs maximum at 1/3 of the its length, the curve of imitate approximately like sinusoid.By changing load and inner pressure separately, the relationship between most stress, strain, displacement and load, inner pressure were gained.. Formula to calculate stress, strain and displacement are developed by the results of above analyse. Conjunctional coefficient is close to 1, it has high value for exertion.With basic principle of tire stable temperature field and three basic suppositions, the stable temperature field analysis model was established. The tire high temperature area mainly concentrates in the shoulder, internal surface and the circle. Three representative sections were selected, temperature along thickness direction has been analyzed, and the reason of it was analyzed; Considering the uniform condition of working condition, three representative spots were selected. The data obtained by ADINA analysis and the experiment were compared in order to confirm the model is accuracy and reliability. The comparison and analysis between theoretical and experimental result indicate that the biggest error is less then 25 percent. This indicated that the result obtained by analysis with ADINA is reliable, it can meet the project needs.With the help of thermo-mechanical coupling function in ADINA, temperature rise process of tire was simulated. Temperature rise is very quick in 20 minutes, afterwards the speed of temperature rise slow-down in 50 minutes, heat generations and the radiation achieved the dynamical equilibrium, the temperature maintained invariable, this is the time that internal temperature field had achieved stable. The comparison and analysis between theoretical and experimental results indicate that the two results be with the same tendency in the whole region. Maintaining other parameters to be invariable, and changing velocity, load, inner pressure, entironmental temperature, ullage gene, thermal conductivity of rubber and hub separately, the influence between them was analyzed. Five convenient formulas on the highest temperature rise and velocity, load, inner pressure, entironmental temperature, ullage gene was built by regression analysis. These formulas is important to prevent accidents, for example, blowout, and so on.