抄録
The fatigue life prediction law of internal fatigue failure referred to as fish eye was not made. Therefore this study paid attention to the internal crack growth properties and calculated fatigue life based on the crack growth properties which put next two internal crack growth properties together. (1) the small crack growth properties of the internal interposition thing circumference and (2) the surface crack growth properties in vacuum which simulates the environment of internal fatigue. The results showed that the fatigue life that was calculated was equal almost the real life under some stress.
