Self-Locking of Bolt-Nut Joints under Repeated Impacts : Theory and Experiments

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概要

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• In a bolted joint receiving repeated impacts, the slip between external and internal threads is the cause of loosening of the employed fastener and subsequent failure of the joint. Selection of right locking method is important to minimize the detrimental effects of the slip in a joint. In this paper, firstly, a theoretical formula for self-locking of threaded fastener has been deduced from the theory of self-loosening process. Secondly, an equation for critical preload to cope with a certain repeated impact has been derived from the experimental results. Thirdly, by comparing the equation with the formula, the significance of parameters in equation has been clarified and the expressions of the parameters have been found out. Lastly, on the basis of experimental results, the performance of different locking method have been evaluated, the causes of difference of each performance have been evaluated, the causes of difference of each performance have been clarified, and the coefficients of impulsive friction for the threads have been calculated.

• 一般社団法人日本機械学会の論文

著者

• Koga Kazuo

  The Institute Of Vocational Training

• ISONO Hiroaki

  The institute of Vocational Training

関連論文

• Self-Locking of Bolt-Nut Joints under Repeated Impacts : Theory and Experiments
• Loosening by Repeated Impact of Threaded Fastenings
• The Effect of Thread Angle on Loosening by Impact : 1st Report, Theoretical Analysis
• Study on Self-loosening of Bolted Joints Taking Account of Characteristics of Impulsive Friction

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