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Research Article | Open Access

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

Junbo ZHOU1, Jianhua LIU1, Huajiang OUYANG2, Zhenbing CAI1, Jinfang PENG1, Minhao ZHU1( )
 Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China
 School of Engineering, University of Liverpool, Liverpool L69 3GH, UK
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Abstract

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.

Keywords

bolted fastenerloosening curvefretting, coatingdynamic shear load

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Friction
Volume 6 Issue 1,
March 2018
Pages 32-46
DOI: 10.1007/s40544-017-0160-z
Cite this article:
ZHOU J, LIU J, OUYANG H, et al. Anti-loosening performance of coatings on fasteners subjected to dynamic shear load. Friction, 2018, 6(1): 32-46. https://doi.org/10.1007/s40544-017-0160-z

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Received: 02 November 2016
Revised: 19 March 2017
Accepted: 24 March 2017
Published: 25 July 2017
© The author(s) 2017

This article is published with open access at Springerlink.com

Open Access: The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http:// creativecommons.org/licenses/by/4.0/), 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.
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