• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2024, Vol. 60 ›› Issue (21): 132-143.doi: 10.3901/JME.2024.21.132

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Study on Modeling Method and Bolt Loosening Characteristics of Self-locking Nut

TIAN Jing1, GAO Chong1, GUAN Jiaoyue1, FU Pengzhe2, LIU Shiyun2, YAO Yudong3   

  1. 1. College of Aero Engine, Shenyang Aerospace University, Shenyang 110136;
    2. AECC Shenyang Aero-engine Design and Research Institute, Shenyang 110015;
    3. School of Power and Energy, Northwestern Polytechnical University, Xi'an 710129
  • Received:2023-11-30 Revised:2024-05-20 Published:2024-12-24

Abstract: The anti-vibration and anti-loosening performance of the self-locking nut with closure is obviously better than that of the common nut, and it is widely used in the connection structure of the aeroengine. However, due to the complex shape of the self-locking nuts, it is difficult to accurately model them and lack of relevant simulation research. Firstly, the thread expression in the receptacle area of self-locking nut is derived, and a high-fidelity model of self-locking nut is established by combining the standard bolt model generation method. Then, the effects of structural parameters such as thickness, volume and length of self-locking nut's closure area and load parameters such as initial preload, amplitude of excitation load and friction coefficient of contact surface on the loosening characteristics of self-locking bolt-nut connection structure are simulated and analyzed. Finally, loosening characteristics test of self-locking nuts with closure is carried out. The results show that the residual preload increases by 12.2%, 11.4% and 7.7% respectively with the increase of structural parameters. The initial preload and the friction coefficient of the contact surface increase the residual preload by 37.1% and 6.9% respectively, while the increase of the amplitude of the exciting load decreases the residual preload. When the amplitude of initial preload and excitation load changes, the corresponding average error of simulation is 3.79% and 3.55% respectively. The above results prove the accuracy of the high-fidelity modeling method in this paper, which lays a foundation for simulation research and self-locking mechanism exploration of the closure self-locking nut, and also provides guidance for structure optimization and engineering application of the nut.

Key words: receiving self-locking nut, high fidelity modeling, finite element analysis, bolt loosening test, bolt loosening characteristics

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