Loosening of Nut by Vibration

Abstract

The objective of this paper is to study, theoretically, the effects of various parameters on the amount of nut loosening per dynamic loading cycle applied in the direction of bolt axis. The results show that the capability in loosening resistance of bolt-nut connections can be improved –by decreasing the helix angle and/or increasing thread friction, base friction, bolt length, nut wall thickness, and nut height.