Sing the Ultrasonic Method to Detect Fatigue Cracks in Metal Structures

Abstract

The features of identifying fatigue cracks using ultrasonic thickness gauging methods are reviewed. Theoretical calculations of the ultrasonic reflection coefficient from the «steel-air» interface of a thin medium were carried out. Experimental measurements were carried out to detect fatigue cracks in metal products. It has been established that there is a relationship between the ultrasonic reflection coefficient and the width of the layer in the crack, which in turn can change depending on the temperature of the
product and the degree of mechanical stress causing deformation of the controlled part.