At present, the research of gear bending fatigue reliability test mainly focuses on how to improve the bearing capacity of gears, which has been analyzed and studied by many scholars at home and abroad. With the development of gear test methods, gear test plays an important role in improving the bending fatigue strength of gears. For example, many coefficients in the international organization for Standardization (ISO) gear bearing capacity calculation method, which integrates a large number of existing research results, and the gear tooth fatigue limit stress of various materials are based on a large number of tests.
Heirani. H. et al. Simulated the crack propagation path of two-dimensional spur gear with ABAQUS. Based on linear elastic fracture mechanics, the components were loaded for different initial crack positions, and the crack initiation and propagation were simulated according to the mode II stress intensity factor at the crack tip.
Hiung fimgzen et al. Used the extended finite element method to study the influence of different torques on the crack stress intensity factor, which overcomes the limitations of the traditional finite element method and saves the time of re meshing.
Yuanxiachen et al. Proposed a method to estimate the life of cracked gear through degradation model. Firstly, the two-dimensional finite element model of Cracked Gear was established by using FRANC2D software, and the propagation path under different initial crack angles was studied; Then, through the improved meshing stiffness model and lumped mass dynamics model, the gear vibration responses with different initial crack angles are obtained; Finally, the quantitative relationship between crack propagation process and deterioration level is established, which can be used to predict the service life of gears.
Xinxiao Bian et al. Conducted fatigue fracture experiments on gears with cracks, and obtained the propagation path and stress intensity factor. Compared with the results of linear elastic fracture mechanics theory and FRANC3D simulation, the results show that in the early stage of crack propagation prediction, The simulation results of FRANC3D are close to the theoretical calculation results of linear elastic fracture mechanics. With the increase of crack length, the difference between them becomes larger and larger; However, comparing the experimental and FRANC3D simulation results, the difference between the two results is very small, and the error is 2.4% – 13.3%. Therefore, the simulation is really close to the experimental results.