Fracture analysis on the double-head bolt of wind farm

Yan Xu; Liuhan Bi; Yinglai Liu; Tianhan Xu; Zhenjun Feng; Qiang Bai; Neng Lv; Chen Shen; Fengping Yang

doi:10.1117/12.2672866

25 April 2023 Fracture analysis on the double-head bolt of wind farm

Yan Xu, Liuhan Bi, Yinglai Liu, Tianhan Xu, Zhenjun Feng, Qiang Bai, Neng Lv, Chen Shen, Fengping Yang

Proceedings Volume 12598, Eighth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2022); 125981Y (2023) https://doi.org/10.1117/12.2672866
Event: Eighth International Conference on Energy Materials and Electrical Engineering (ICMEE 2022), 2022, Guangzhou, China

Abstract

The bolts of wind farm are prone to fatigue failure during service. Generally, the fatigue stress does not require too much external force. Sometimes the stress generated by bolts is much lower than the yield strength of bolts. In view of the failure problem of connecting bolts used in wind farms, the failure causes of the double-head bolt were studied by macroscopic inspection, chemical composition analysis, metallographic analysis, and scanning electron microscopy. The results showed that the fracture was a fatigue fracture, and the fatigue source area was located at the bottom of the thread tooth. Under the action of long-term alternating stress, the single source crack evolved into multi-source fatigue cracks, where the fracture was related to the larger stress in the process of installation and service. This paper analyzed the causes of bolt failure and put forward effective suggestions for the service environment of wind turbine bolts.

Citation Download Citation

Yan Xu, Liuhan Bi, Yinglai Liu, Tianhan Xu, Zhenjun Feng, Qiang Bai, Neng Lv, Chen Shen, and Fengping Yang "Fracture analysis on the double-head bolt of wind farm", Proc. SPIE 12598, Eighth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2022), 125981Y (25 April 2023); https://doi.org/10.1117/12.2672866

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