| Citation: | JI N，LIU J，WANG H R，et al. Simulation analysis and experimental study on stiffness and fatigue life fluctuation of leaf spring rubber bearings[J]. Journal of Beijing University of Aeronautics and Astronautics，2025，51（5）：1726-1734 （in Chinese） doi: 10.13700/j.bh.1001-5965.2023.0263
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The leaf spring rubber bearings are important load-bearing and vibration-absorbing components in heavy trucks and often suffer from short fatigue life and poor durability under cyclic loading conditions. This work took the leaf spring rubber bearing as the research object, calculated its vertical static stiffness, and compared it with the experimental stiffness. The reason why the experimental stiffness curve is folded was explained through bearing forces. Based on the critical plane method and fatigue crack propagation theory, the dynamic heat build-up and fatigue life of the leaf spring rubber bearing under a vertical compressive load of 260 kN were predicted by using a thermo-mechanical coupling analytical approach. The results show that the error between the simulated maximum temperature and the experimental temperature is around 5.0%, and the error between the predicted fatigue life and the mean value of the bench test is 7.5%. Based on the tensile fatigue test data of rubber specimens, a two-parameter Weibull distribution model for crack precursor size is fitted, and the initial size range of microcracks is inferred to be between 29.8 μm and 62.8 μm, with a median of 38.5 μm. The fatigue simulation life of the leaf spring rubber bearing calculated based on the distribution data of the crack precursor size ranges from 18 000 to 39 000 cycles, quantitatively explaining the fluctuation of the bench fatigue test life. This work can provide guidance for the optimal design of the fatigue life of vibration-absorbing rubber products.
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