On the Self-loosening Mechanism of Bolted Joints under Transverse External Force

Abstract

This paper presents the results of examination on the theory for the self-loosening mechanism of bolted joints, by A. Yamamoto and S. Kasei, through the experiments under different loading conditions. It is the main theme to make clear whether the theory can become or not a basic way of thinking which can be suitable for the thread-loosening under whole cases of transverse external force. Considering results obtained from the experiments in which vibration (frequency range ; to 10 Hz) and impact tests are made, it is shown that the fundamental difference is not found in the behavior of self-loosening and that the above-mentioned theory can be regarded to be basically applicable to the cases of transverse external force.