Research Status of Test Method for Bending Fatigue Life of Heavy Duty Gear
WANG Zhiyuan1,2, XING Zhiguo2, WANG Haidou2, LI Guolu1, LIU Kejing2, XING Zhuang2
1 School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130; 2 National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072
Abstract: Heavy-duty gears are the heart of the transmission system of a large mechanical system (bulldozers, excavators, armored vehicles, etc.), their main function is to transfer motion and torque according to the specified rotational speed ratio. With the development of science and technology and the increasingly advanced of military equipment, heavy-duty gears not only have made new achievements in materials performance, gear profile design and bearing capacity, but also gain outstanding improvement in testing technology of gear performance. Issues including the fatigue strength of gears, the quality of gear transmission that were different to study quantitatively in the past can already be measured by practical means. In the study of fatigue performance of heavy-duty gears, tooth gear pitting corrosion, gluing, abrasion and other minor damage caused by contact fatigue will deteriorate the gear transmission efficiency, lead to the slight dislocation of the meshing and so forth. Bending fatigue will directly induce to tooth root cracks and even the tooth break, which lead to serious accidents. Therefore, it is of great significance to accurately test the bending fatigue life of heavy-duty gears, analyze the flexural fatigue performance, optimize the gear design and improve the gear performance in order to monitor the equipment failure caused by the failure of bending fatigue and avoid major accidents during service. The bending fatigue life of heavy-duty gears is affected by many factors, including material properties, processing dimensions, preparation techniques and test methods, therefore the quantitative measurement of bending fatigue life has always been a hot topic among researchers worldwide. The research on the bending fatigue life of heavy-duty gears can be summarized into the following three aspects. Firstly, the theory of bending fatigue has been developed to the practical application of acoustic emission signal detection, optical image fractal theory calculation and computer finite element mathematical simulation. Secondly, the performance testing experiments including single tooth/bidentate pulse loading, dynamic meshing loading and other test methods have been developed. Thirdly, data processing methods like up-down method, group method, rain flow method and a variety of S-N curve fitting and so forth are emerged. The application of these analysis methods and test methods can greatly cut the experimental cost, raise the analysis efficiency and reduce the experimental error, so as to improve the accuracy of bending fatigue life testing of heavy-duty gears. According to the research status at home and abroad, the bending fatigue performance of heavy duty gears is explored mechanically and experimentally in view of the principle of bending fatigue test of heavy-duty gears, the testing methods and the bending fatigue data processing. The article is expected to provide the theoretical basis, specific test methods and data processing means for calculating the bending fatigue strength of heavy duty gear and predicting bending fatigue life.
王志远, 邢志国, 王海斗, 李国禄, 刘珂璟, 邢壮. 重载齿轮弯曲疲劳寿命测试方法研究现状[J]. 材料导报, 2018, 32(17): 3051-3059.
WANG Zhiyuan, XING Zhiguo, WANG Haidou, LI Guolu, LIU Kejing, XING Zhuang. Research Status of Test Method for Bending Fatigue Life of Heavy Duty Gear. Materials Reports, 2018, 32(17): 3051-3059.
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2018, Vol. 32 
