Abstract
For the detection of fatigue damage before crack initiation in an austenitic stainless steel,SUS304, we investigated the possibility of the fatigue damage detection and evaluation from the change in the magnetization. Fatigue tests and measurements of magnetization conducted under the stress ration, R, of -1. The experimental results showed that the location, where the maximum changes in the value of the changes in the leakage magnetic flux density B_z observed, coincided with the location of the stress concentration, where the crack was formed, and the value of B_z rapidly increased before crack initiation. When no crack was found, increasing rate of B_z decreased with increasing the number of cycles, and the value of B_z was saturated to a certain value. It was found that fatigue damage before crack initiation can be detected from the change in the magnetization in SUS304 steel.
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