Journal of Shanghai Jiao Tong University(Science) ›› 2020, Vol. 25 ›› Issue (4): 526-530.doi: 10.1007/s12204-020-2173-4

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Fatigue Life Prediction for Flange Connecting Bolts of Wind Turbine Tower

YU Zelin (于泽林), SUN Pengwen (孙鹏文), WANG Dong (王栋)   

  1. (1. School of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;
    2. Research Institute, Beiqi Foton Motor Co., Ltd., Beijing 102206, China)
  • 出版日期:2020-08-28 发布日期:2020-07-29
  • 通讯作者: SUN Pengwen (孙鹏文) E-mail:pwsun@imut.edu.cn

Fatigue Life Prediction for Flange Connecting Bolts of Wind Turbine Tower

YU Zelin (于泽林), SUN Pengwen (孙鹏文), WANG Dong (王栋)   

  1. (1. School of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;
    2. Research Institute, Beiqi Foton Motor Co., Ltd., Beijing 102206, China)
  • Online:2020-08-28 Published:2020-07-29
  • Contact: SUN Pengwen (孙鹏文) E-mail:pwsun@imut.edu.cn

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摘要： Flange joint part is the weak link of wind turbine tower. In view of the special structure, complex stress
and easy failure of the connecting bolt of the wind turbine tower flange, the relationship between the external
load of the tower section and the internal stress of the bolt is established by the finite element method, and the
time series internal stress of the bolt is calculated by the Schmidt-Neuper algorithm. The S-N curve which is
suitable for the connecting bolt material of the tower flange is selected by the GL2010 specification. On the basis
of Miner’s fatigue cumulative damage theory and rain flow counting method, the fatigue strength of the whole
ring bolt is roughly calculated, and the most dangerous part is determined. The axial symmetry model of screw
connection is used for accurately calculating the fatigue cumulative damage of the bolt at the dangerous part.
The results show that the fatigue life of the bolts in the most dangerous position can meet the requirements, the
engineering algorithm has advantages in determining the dangerous part of the whole ring bolt, and the finite
element method has high accuracy in predicting the fatigue life of the bolts in the dangerous part. The proposed
method is feasible and effective in predicting the fatigue life of the flange joint bolts of the tower.

关键词: fatigue cumulative damage, internal stress of bolt, engineering algorithm, flange connecting bolt,
wind turbine tower

Abstract: Flange joint part is the weak link of wind turbine tower. In view of the special structure, complex stress
and easy failure of the connecting bolt of the wind turbine tower flange, the relationship between the external
load of the tower section and the internal stress of the bolt is established by the finite element method, and the
time series internal stress of the bolt is calculated by the Schmidt-Neuper algorithm. The S-N curve which is
suitable for the connecting bolt material of the tower flange is selected by the GL2010 specification. On the basis
of Miner’s fatigue cumulative damage theory and rain flow counting method, the fatigue strength of the whole
ring bolt is roughly calculated, and the most dangerous part is determined. The axial symmetry model of screw
connection is used for accurately calculating the fatigue cumulative damage of the bolt at the dangerous part.
The results show that the fatigue life of the bolts in the most dangerous position can meet the requirements, the
engineering algorithm has advantages in determining the dangerous part of the whole ring bolt, and the finite
element method has high accuracy in predicting the fatigue life of the bolts in the dangerous part. The proposed
method is feasible and effective in predicting the fatigue life of the flange joint bolts of the tower.

Key words: fatigue cumulative damage, internal stress of bolt, engineering algorithm, flange connecting bolt,
wind turbine tower

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