Abstract
In order to clarify the self-loosening mechanism of threaded joints which are subjected to ultrasonic vibration in the axial direction, the separating phenomena between the bearing surfaces are investigated experimentally and theoretically. The obtained conclusions are as follows : (1) The theoretical values of the amplitude on the assumption that the bearing surface may begin to separate when the amplitude of vibrational stress on the surfaces reaches the mean compressive stress by tightening force approximately agree with the experimental ones. Then the above-mentioned value, which is called “Critical Amplitude at the Separation between Bearing Surfaces”, is proposed as a criterion of self-loosening of threaded joints. (2) The separation between bearing surfaces is affected by lubricating condition. The critical amplitude with silicone grease is larger than that with machine oil or without lubricant in the range of this experimental conditions.
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