Loosening by Repeated Impact of Threaded Fastenings

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概要

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• It is common experience that nuts and other threaded fasteners can be loosened by vibration or by impact even though they are initially tight. This report proves that a threaded fastener is hard to loosen when the angle of thread and the measurement of the screw end are properly chosen. The fastener with 60 deg. V thread is easy to loosen. Because the compressive stress waves, being propagated from the pressure falnk, are reflected at the free end of the screw, when they change into tensile stress waves, and they return to the pressure flank on the bolt side only. So a threaded fastener becomes hard to loosen, when the tensile stress waves don't return to the pressure falnk of the bolt thread. On the following two occasions, the tensile stress waves don't return to the pressure flank. (1) When the tensile stress waves are propagated towards the unthreaded part of the bolt. (2) When they are reflected back to the pressure falnk being changed into compressive stress weves.

• 一般社団法人日本機械学会の論文

著者

• Koga Kazuo

  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

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