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Fatigue Life Analysis of Flexspline Based on Finite Element Simulation Model with Non-Simplified Flexible Bearing Structure of Harmonic Reducer and Measured SN Curve
Liang-Shan Xiong a, Jun-Fan Xie b, Yong Wang b and Long-Jun Luo c
aCollege of electromechanical and automation, Wuchang Shouyi University, Wuhan 430074, China
bSchool of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
cEngineering practice innovation center, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
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Abstract:
When predicting the fatigue life of the flexspline in a harmonic reducer using the simulation results from the dynamic numerical model of the harmonic reducer, it is common practice to simplify the flexible bearing structure significantly for convenience. Additionally, the SN curve of the material, obtained from tests conducted by others, is often directly used for calculations. This increases the likelihood of significant errors in the predicted fatigue life of the flexspline. To address this issue, a method is proposed that uses the stress simulation results from a harmonic reducer numerical model with a non-simplified flexible bearing structure, combined with the experimentally measured SN curve, to predict the fatigue life of the flexspline. Firstly, a finite element dynamic model of a hat-type harmonic reducer, which includes a complete flexible bearing structure (often simplified by researchers for computational convenience when constructing numerical simulation models of harmonic reducers) and accurately reflects the stress state of the flexspline, is established. Subsequently, the SN curve of the flexspline material 40CrNiMoA is obtained by single-point test. Finally, combined with the finite element stress analysis results and material SN curve, the fatigue life of the flexspline is calculated in nCode software.
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Keywords: flexspline, fatigue life, finite element dynamic simulation, SN curve
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©
2026
CSME , ISSN 0257-9731
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