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Anti-loosening performance of coatings on fasteners subjected to dynamic shear load
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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, MoS 2, 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 MoS 2 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 MoS 2 coating reveal that a reduced initial tightening torque leads to fretting wear on the thread contact surfaces of fasteners, thereby aggravating the damage.
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EXPERIMENTAL STUDY OF LOOSENING OF THREADED FASTENERS DUE TO DYNAMIC SHEAR LOADS
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A Study of Early Stage Self-Loosening of Bolted Joints
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Carbon-based solid-liquid lubricating coatings for space applications-A review
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Junbo ZHOU. He received his master degree in mechanical engineering in 2009 from Wuhan University of Technology, Hubei, China. After then, he worked in Chengdu University of Technology, Sichuang, China. In 2011, he was a PhD student in the Southwest Jiaotong University. His research interests include fretting wear and design of fastener connection.
Jianhua LIU. He received his bachelor degree and PhD degree from Southwest Jiaotong University, Sichuang, China, in 2010 and 2016, respectively. He is currently a post-doctor at School of Mechanics and Engineering, Southwest Jiaotong University. His research interests include friction, wear and design of fastener connection.
Huajiang OUYANG. He received his bachelor degree, master degree and PhD degree from Dalian University of Technology, China, in 1982, 1985 and 1989, respectively. He is a full professor in the School of Engineering, University of Liverpool, UK. His main research areas are structural dynamics and control (particularly on friction-induced vibration and noise, and moving-load dynamics), and structural identification.
Zhenbing CAI. He received his bachelor degree and PhD degree from Southwest Jiaotong University, Sichuang, China, in 2003 and 2009, respectively. He is currently a professor at School of Mechanical Engineering, Southwest Jiaotong University, deputy director of Tribology Research Institute. His research interests include friction and wear, surface engineering and instrument development.
Jinfang PENG. He received his bachelor degree and PhD degree from Southwest Jiaotong University, Sichuang, China, in 2006 and 2012, respectively. After then, he worked in the same university and became an assistant researcher. His research interests include fretting fatigue and failure analysis.
Minhao ZHU. He received his bachelor degree, master degree from Southwest Jiaotong University, Sichuang, China, in 1990 and 1993, respectively. Then he worked in Southwest Jiaotong University until now. From 1996 to 2001, he received his PhD degree from Southwest Jiaotong University, Sichuang, China. His current position is a Professor, Ph.D. student advisors, Cheung Kong Scholars and dean of School of Materials Science and Engineering. His research areas cover fretting wear, fretting fatigue, surface engineering and design of fastener connection.
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2223-7690-06-01-32© The author(s) 2017. This article is published with open access at Springerlink.com
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