A database of fatigue strength in air and high temperature water environments for the materials used in LWR structural components has been developed. It includes the fatigue data acquired in the EFT project entrusted by METI, Japan, as well as public data obtained from domestic and overseas literature. One of the features of the database is that it includes about 2,500 images such as scanning electron micrographs of the fractured surface of the specimen after fatigue test. Another feature is that the program can search data, draw graphs such as S-N curves and hysteresis loops automatically, and make calculations of the hysteresis energy equivalent to the area of hysteresis loop, for example. The structure of the database, the contents of the data compiled, and the functions of the program are presented with actual examples, and the characteristics of the database are discussed.

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