, Volume 6, Issue 1, pp 32–46 | Cite as

Anti-loosening performance of coatings on fasteners subjected to dynamic shear load

  • Junbo Zhou
  • Jianhua Liu
  • Huajiang Ouyang
  • Zhenbing Cai
  • Jinfang Peng
  • Minhao Zhu
Open Access
Research Article


This paper investigates the self-loosening of threaded fasteners subjected to dynamic shear load. Three kinds of typical coatings, PTFE, MoS2, and TiN applied to bolts and nuts, are tested in this investigation. The study experimentally examines the loosening mechanisms of fasteners and assesses the anti-loosening performance of the three tested coatings based on their tightening characteristics, loosening curves, and the damage of thread surface. Additionally, the anti-loosening performance of the three coatings is compared under different load forms. The results indicate that the PTFE and MoS2 coatings have significant anti-loosening effect, whereas the anti-loosening performance of TiN coating is not satisfactory. It is also found that an appropriate increase of the initial tightening torque can significantly improve the anti-loosening effect. In addition, the microscopic analyses of PTFE and MoS2 coating reveal that a reduced initial tightening torque leads to fretting wear on the thread contact surfaces of fasteners, thereby aggravating the damage.


bolted fastener loosening curve fretting coating dynamic shear load 



The authors gratefully acknowledge the financial support provided by the National Science Funds for Distinguished Young Scholars (No. 51025519), the Changjiang Scholarships and Innovation Team Development Plan (No. IRT1178), and the Self-Topic Fund of Traction Power State Key Laboratory (No. 2016TPL-Z03).


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© The author(s) 2017

Open Access: The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Junbo Zhou
    • 1
  • Jianhua Liu
    • 1
  • Huajiang Ouyang
    • 2
  • Zhenbing Cai
    • 1
  • Jinfang Peng
    • 1
  • Minhao Zhu
    • 1
  1. 1.Tribology Research InstituteSouthwest Jiaotong UniversityChengduChina
  2. 2.School of EngineeringUniversity of LiverpoolLiverpoolUK

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