Structural Engineering and Mechanics

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Load-transferring mechanism and evaluation theory of bolt with single and double nut fasteners

  • Qiyu Li (College of Civil Engineering, Research Center of Tower Mast Structure, Nanjing Tech University) ;
  • Dachang Zhang (College of Civil Engineering, Research Center of Tower Mast Structure, Nanjing Tech University) ;
  • Hao Xu (Wuxi Metro Construction Co., Ltd.) ;
  • Yibi Li (College of Civil Engineering, Research Center of Tower Mast Structure, Nanjing Tech University) ;
  • Weiqun Chen (Nanrui Electric Power Design Corporation Limited) ;
  • Kaixuan Zhang (The IT Electronics Eleventh Design & Research Institute Scientific and Technological Engineering Corporation Limited)
  • Received : 2022.04.02
  • Accepted : 2023.03.21
  • Published : 2023.04.25
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Abstract

The use of the ordinary double nut (i.e., ODN) composed of a master nut (i.e., M-nut) and a slave nut (i.e., S-nut) is a highly efficient method to prevent bolts loosening. A novel double nut (i.e., FODN) composed of a master nut (i.e., M-nut) and flat slave nut (i.e., FS-nut) is proposed to save raw materials. The bolt fastening tests with single nut, ODN and FODN are performed to investigate the preload and counterbalance forces. Corresponding finite element analysis (FEA) models are established and validated by comparing the preload with the experimental results. The load-bearing capacity, the extrusion effect, and the contact stress of each engaged thread for ODN and FODN are observed by FEA. The experimental and simulated results revealed that the bolt fastening with double-nut has different load-transferring mechanisms from single-nut. Nevertheless, for double-nut/bolt assemblies, the FS-nut can provide load transfer that is like that of the S-nut, and the FODN is a reasonable and reliable fastening method. Furthermore, based on the theory of Yamamoto, a formula considering the extrusion effect is proposed to calculate the preload distribution of the double-nut, which is applicable to varying thicknesses of slave-nuts in double-nut/bolt assemblies.

Keywords

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