Abstract
A method to estimate the bending fatigue initiation life of disposable gears is proposed in this study. Disposable gears used in disposable aeronautics and space equipment undertake much higher loads than general gears. The main damage type for disposable gears is low-cycle bending fatigue failure. In the study, the finite element method is used to analyze the stress-strain state of disposable gears. The moving load model is established to simulate the real load acting on the teeth. For the purpose of analyzing the multi-axial stress state of teeth roots, the crack initiation life is calculated based on the critical plane theory. As the basis parameter of the critical plane theory, the orientation of critical plane is determined by using maximum variance method. The comparison of the simulation results and the experiment data shows that it is security to predict the bending fatigue crack initiation life of disposable gears using the method provided in the study.
Highlights
Gears are general transmission parts in mechanical structures
The life of some disposable aeronautics and space equipment is usually around several hundreds of seconds which is much shorter than the life of general gears
Eq (4) is established in △N1OK shown in Fig. 4: Procedure of moving load model: Based on the algorithm mentioned above, it is feasible to analyze stress state of teeth root by using finite element method
Summary
Gears are general transmission parts in mechanical structures. The design criterion of general gears is established for stable and enduring running. It means that low-cycle fatigue failure is a main damage model for disposable gears. Considering the high reliability requirement of disposable aeronautics and space equipment, low-cycle fatigue initiation life of gears is more interesting. It is necessary to establish a model to estimate the low-cycle fatigue initiation life of disposable gears.
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