Influence mechanism of bolted joint with geometric irregularity bearing surface on anti-loosening performance. (June 2021)

• Record Type: Journal Article
• Authors: Yang, Bin; Sun, Qingchao; Lin, Qingyuan; Wang, Lintao; Zhang, Xianlian; Ma, Yue
• Is Part Of: International journal of pressure vessels and piping. Volume 191(2021)
• Publication Date: 2021-06
• Subjects: Bolted joint -- Anti-loosening -- Non-parallel bearing surface -- Slip factor -- Parametric model; Pressure vessels -- Periodicals; Pipe -- Periodicals; Récipients sous pression -- Périodiques; Tuyaux -- Périodiques; Pipe; Pressure vessels; Periodicals; 681.76041
• DOI: 10.1016/j.ijpvp.2021.104364
• Languages: English
• ISSNs: 0308-0161

Abstract

Abstract: Geometrical deviations in the manufacture and assembly of mechanical products often result in non-parallel bearing surfaces in the bolted joint. To reveal the influence of the non-parallel bearing surface on the loosening of the bolted joint, the paper proposes a non-parallel bearing surface anti-loosening analysis model, revealing the anti-loosening mechanism of the non-parallel bearing surface, and found that the non-parallel bearing surface will introduce additional contact pressure and contact friction torque. Within a certain range, the contact pressure and the contact friction torque increase as the inclination angle of the non-parallel bearing surface increases, and the thread anti-loosening performance is improved. A parametric finite element model is further established to verify the existence of additional contact pressure and contact friction torque, and the slip factor is introduced to evaluate the loosening. Finally, the anti-loosening analysis model and the finite element model are validated by the loosening experiment of the non-parallel bearing surface. The research result provides a new idea for the anti-loosening control of bolted joints. Highlights: The non-parallel bearing surface creates a bending moment on the bolt joint that causes the threads to be subjected to the lateral force, and the nut moves laterally, pressing the thread contact pairs to create additional contact forces and contact friction torques. The additional contact force and the contact friction torque increase the bolt's anti-loosening properties. The anti-loosening ability of the non-parallel bearing surface is affected by the inclination angle, and the bigger the inclination angle, the stronger the anti-loosening ability. In the simulation process, combined with the slip factor, the influence of non-parallel bearing surface is further revealed, and the relevant laws are consistent with the theory and experiment.