Concerning to Measure for Crack Propagation in FSM-monitoring

Abstract

In order to evaluate the crack propagation behavior in FSM-monitoring, which is one of the non destructive inspection methods based on the electric potential difference method, a series of experiments and analyses were carried out. It was confirmed that the change of crack propagation direction or the initiation and propagation of cracks could be monitored by the variation of FC value corresponding to the potential difference change. It was elucidated that the initial potential difference largely affected FC value. The results indicated that arrangement of pairs and current direction should be noted for removing the effect of initial potential difference in monitoring of crack initiation and propagation. When the effect cannot be removed, not only FC value but also the potential difference change should be used as the measure for crack propagation in FSM-monitoring.