Abstract
Fatigue evaluation methods have been proposed based on environmental fatigue test results regarding parameters selected for simulating BWR and PWR conditions. Recently, effects of strain wave form have been discussed by comparing experimental fatigue life with predicted fatigue life evaluated by modified rate approach method. Environmental fatigue life of carbon, low-alloy and stainless steels under sine wave form was reported to be longer than that predicted in simulated BWR environment. In simulated PWR environment, however, it was reported that environmental fatigue life under sine wave form could be predicted appropriately. In this study, experimental fatigue lives of carbon steel under two kinds of strain rate changing conditions of sine wave and the wave obtained in thermal fatigue test in simulated BWR environment were compared with predicted fatigue lives. Modified rate approach method was indicated to be applicable to predict fatigue lives under these two kinds of strain rate changing conditions.
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