Study on key mechanical properties of the flexible spoke non-pneumatic tire considering thermo-mechanical coupling

Based on the combination of numerical analysis and prototype test, this paper explores the key mechanical properties of the flexible spoke non-pneumatic tire under thermo-mechanical coupling, mainly including basic mechanical properties and fatigue properties. Based on the thermo-mechanical sequential coupling method, the structural field and temperature field of the flexible spoke non-pneumatic tire is analyzed, and the thermo-mechanical coupling analysis model is constructed by using the predefined field method. Based on the thermo-mechanical coupling analysis model, the basic mechanical properties of the flexible spoke non-pneumatic tire are investigated, and the J-integral method is used to predict the fatigue life of the non-pneumatic tire. The results show that the vertical displacement, the grounding area, and the axial displacement in the rolling process with thermo-mechanical coupling are similar to those without thermo-mechanical coupling, but each of them increases; based on the J-integral method, the predicted fatigue failure mileage of non-pneumatic tire is 2.67 × 104 km, and the fatigue failure mileage of indoor drum test is 2.44 × 104 km, which is basically consistent. The key mechanical properties of the flexible spoke non-pneumatic tire considering thermo-mechanical coupling are closer to the actual operating conditions. The development of this paper has important theoretical significance and application value for the development of tire safety technology.