Study on the relationship between the shape of stress crack and its detection signal

Abstract

Long term stress action is easy to cause stress crack of pressure vessel. In the process of producing corrosion stress crack, the early stage of crack growth is slow, and the evolution process reaches critical size, which will become a large crack in a very short time, with great harm. In this study, the influence of crack shape on eddy current detection signal is studied. The general finite element analysis software is used as the simulation calculation tool to study the influence of different crack shape on eddy current detection signal size. The control variable method is used to get the detection signal of different shape cracks under other fixed conditions. By comparing with the fatigue crack detection signal, we have mastered the influence of crack shape on detection signal.