车轮疲劳寿命仿真的网格无关性分析与验证

This paper investigates the mesh independence of wheel fatigue life simulations. To address issues such as long fatigue assessment cycles, high testing costs, and the strong influence of mesh size on the finite element simulation accuracy, fatigue life predictions were carried out using both the nominal stress method and the local stress-strain method. The mesh independence of the simulation results was verified based on the grid convergence index (GCI) theory, leading to the recommendation of an optimal mesh configuration for fatigue life simulation. A fatigue life simulation method is proposed with high-quality meshing and low error range, which provides a theoretical foundation for establishing mesh independence in fatigue life prediction. Taking an aluminum alloy wheel as the research object, the wheel was meshed with different grid sizes according to the GCI theory. Radial and bending static simulations of the wheel, as well as fatigue life prediction simulations, were then conducted. The simulation results under different grid sizes were analyzed and a criterion was proposed to assess the rationality of tetrahedral meshing for aluminum alloy passenger car wheel hubs. Corresponding verification analysis was conducted. The results show that the GCI can effectively supports the mesh independence analysis and validation in wheel fatigue life simulations. The results in this paper provide a reliable basis for evaluating the suitability of tetrahedral mesh sizes in such applications.