Abstract
Aiming at the problem of the fatigue life prediction of rubber under the influence of temperature, the effects of thermal ageing and fatigue damage on the fatigue life of rubber under the influence of temperature are analysed and a fatigue life prediction model is established by selecting strain energy as a fatigue damage parameter based on the uniaxial tensile data of dumbbell rubber specimens at different temperatures. Firstly, the strain energy of rubber specimens at different temperatures is obtained by the Yeoh model, and the relationship between it and rubber fatigue life at different temperatures is fitted by the least-square method. Secondly, the function formula of temperature and model parameters is obtained by the least-square polynomial fitting. Finally, another group of rubber specimens is tested at different temperatures and the fatigue characteristics are predicted by using the proposed prediction model under the influence of temperature, and the results are compared with the measured results. The results show that the predicted value of the model is consistent with the measured value and the average relative error is less than 22.26%, which indicates that the model can predict the fatigue life of this kind of rubber specimen at different temperatures. What's more, the model proposed in this study has a high practical value in engineering practice of rubber fatigue life prediction at different temperatures.
Highlights
Owing to their superior ability to good wear resistance and tear resistance, rubber materials are widely used in the automobile industry, for example, the tire, vibration isolator and other parts
The fatigue life prediction model is established with strain energy as the fatigue damage parameter, and the fatigue characteristics under different temperatures are predicted by the relationship between the model parameters and temperature
The fitting diagram of strain energy density and fatigue life is shown in figure 4 and the model parameters at different temperatures are shown in table 6
Summary
Owing to their superior ability to good wear resistance and tear resistance, rubber materials are widely used in the automobile industry, for example, the tire, vibration isolator and other parts. The maximum first principal elastic strain was selected as the fatigue damage parameter to predict the fatigue life of an elastomeric pad under different compressive loads. Three kinds of fatigue life prediction models at different temperatures were established using the engineering strain as the damage parameter based on the experimental data. The above researchers only studied the fatigue characteristics under the influence of temperature from the perspective of the type of rubber materials and the selection of fatigue damage parameters, and no model was established to demonstrate the relationship between temperature and fatigue life prediction. Based on the above analysis, the uniaxial tensile fatigue tests of dumbbell rubber specimens are carried out at different temperatures and different loads in this paper. The fatigue life prediction model is established with strain energy as the fatigue damage parameter, and the fatigue characteristics under different temperatures are predicted by the relationship between the model parameters and temperature
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