Evaluation of the possibility of controlling the bolted joints of vessel lids using ultrasonic waves

The aim of the work is to study the applicability of the acoustic method for monitoring the loosening of fasteners on vessel lids, based on the change in signal amplitude during reflection and transmission of ultrasonic waves through the interface between plates. In the course of the work, theoretical dependences of the change in the amplitude of the received signal with a change in the applied pressure were obtained for the case of a flange connection without an additional gasket and in the presence of a gasket made of various materials. It has been established that in the absence of acoustic contact in the flange connection, the amplitude of the signal reflected from the interface is maximum, while in continuous contact it is minimal. The results obtained were verified experimentally using the shadow and echo method of ultrasonic testing. As a result of the study, it was found that the maximum change in the signal amplitude is observed at low frequencies, and when controlled by the shadow method, it is higher than when using the echo method.

Authors: A. V. Kosterina, A. V. Teplyakova

Direction: Physics

Keywords: ultrasonic testing, reflection coefficient, transmission coefficient, amplitude change, contact pressure

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