Abstract
Cavitation decreases fracture life of a structure seriously. The method to predict fracture life by cavity characteristics is suggested through the numerical analysis of the mechanisms for cavitation and the quantitative analysis by an experiment. Cavity characteristics must be defined by nondestructive inspection, because the cavity that generated in the component cannot be confirmed visually. It is hard to confirm the cavity size and the distance between cavities that nucleated inside of structure by a nondestructive method now. Cavity area fraction which could confirm degradation rate using ultrasound system was used in this study instead of cavity size and distance. From equation of relations among cavity area fraction and minimum creep rate and a result of an experiment, cavity increasing rate is very slow and linear in the minimum creep rate region. This is because deformation and cavity growth rate appear linearly by the balance between plastic deformation and stress relaxation. Fracture life was able to predict by confirmation of cavity area fraction on time fraction.
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