As self-loosening of nuts is really a problem for bolted joints in practical use, countermeasures for the loosening is highly required. In this situation non-loosening fasteners are one of the resolutions for any fastened machinery as an essential mechanical element. Self-loosening of threaded bolt/nut systems has been researched in number of works and many of them were based on experiments historically and some were based on the finite element analyses in these years. Authors have reported the static loosening of nut due to the transverse motion of fastened objects in PVP conferences using finite element analyses and showed the loosening mechanism. This paper will show another case based on the dynamic situation namely impacting of the bolt/nut systems as NAS3350/3354 test situation. In this special case, nut loosening was reproduced, too, and it shows that the loosening mechanism is almost the same as the static loosening, although the loading is quite different. Even in impact condition, the analysis showed that the effect of eccentric nut works to prevent self-loosening.
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ASME 2008 Pressure Vessels and Piping Conference
July 27–31, 2008
Chicago, Illinois, USA
Conference Sponsors:
- Pressure Vessels and Piping
ISBN:
978-0-7918-4825-8
PROCEEDINGS PAPER
Self-Loosening Mechanism of Nuts Due to Impacts
Yasumasa Shoji,
Yasumasa Shoji
Chiyoda Advanced Solutions Corporation, Yokohama, Japan
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Toshiyuki Sawa
Toshiyuki Sawa
Hiroshima University, Hiroshima, Japan
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Yasumasa Shoji
Chiyoda Advanced Solutions Corporation, Yokohama, Japan
Toshiyuki Sawa
Hiroshima University, Hiroshima, Japan
Paper No:
PVP2008-61221, pp. 219-225; 7 pages
Published Online:
July 24, 2009
Citation
Shoji, Y, & Sawa, T. "Self-Loosening Mechanism of Nuts Due to Impacts." Proceedings of the ASME 2008 Pressure Vessels and Piping Conference. Volume 2: Computer Applications/Technology and Bolted Joints. Chicago, Illinois, USA. July 27–31, 2008. pp. 219-225. ASME. https://doi.org/10.1115/PVP2008-61221
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