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18. OPTIMIZATION OF FATIGUE LIFE OF TRANSMISSION SHAFT BASED ON RESPONSE SURFACE METHOD

Author

LIU LongJie, ZHAO LiHui, SHI ChengMiao, ZHENG SongLin, WENG Shuo, LIU XiangZhen, and DAI Lei

Subjects
Transmission shaft, Load, Response surface, Life optimization, Mechanical engineering and machinery, TJ1-1570, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

In view of the fatigue failure of the transmission shaft in advance, the study of the stress state and life is carried out. Through the analysis of the actual measured load, the cause of the fatigue failure of the drive shaft in advance is the inconsistent output load of the left and right splines. The finite element model of the transmission shaft is established by using finite element software, and the maximum stress at the root of the right tooth of the transmission shaft is obtained, which is the weak part of the transmission shaft. The response surface method and genetic algorithm are used to optimize the structural parameters of the transmission shaft（tooth root fillet, spline transition arc, and arc groove depth）. After optimization, the stress of the weak part of the transmission shaft tooth root is reduced by 28.3%. The fatigue life of the transmission shaft is increased by five times, and the reliability is higher. Finally, the fatigue test is carried out on the scaled down sample. The test result shows that the life of the drive shaft is doubled. The effectiveness of the optimization method is verified through experiments, and the method has certain reference significance for the optimization of shaft parts in the future.

Published
2022
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45. Static and fatigue performance of overlap welded thin plates

Author

Li-Hui Zhao, Weng Shuo, Song-Lin Zheng, and Da-Ang Li

Subjects
Materials science, law, technology, industry, and agriculture, General Materials Science, Welding, respiratory system, Composite material, law.invention
Abstract

Thin-plate overlap welding is an important connection method for the automobile chassis structure. The fatigue performance of the chassis structural components depends mostly on the welded joints. A detailed understanding of its performance plays an important guiding role in the design of the chassis structure. This study was aimed at investigating the performance of thin-plate overlap welded structures using the static tensile test and fatigue test. The general rule of the influence of base metal thickness on the static strength and fatigue performance of welded joints was also summarized. The failure mode of the welded joint and the crack propagation mechanism were discussed in terms of fracture morphology. The findings might lay a foundation for the anti-fatigue design and lightweight design of the chassis welded structures.

Published
2020

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