抄録
The object of this study is to investigate the mechanism of environmental effects on low cycle fatigue crack growth of SUS316. Low cycle fatigue test and periodical observation on inner surface of a hollow specimen was conducted by developing new type of replica observation. The crack growth in PWR environment was measured and the investigation of environmental effects on crack growth was conducted. Crack initiation rate of fatigue test in PWR environment is faster than in air condition. Consideration of crack initiation in earlier period of fatigue test, acceleration of crack growth rates, coalescence of cracks due to high density of cracks generated in early stage of cycles is necessary to quantify environmental effects on fatigue life.
