超音波法によるクリープ損傷検出の理論的検討

抄録

A theoretical study was made on creep damage detection by ultrasonic wave measurement. The evaluation method was developed in order to predict the ultrasonic attenuation and velocity changes with increasing creep damage. The method was obtained from the results combining the following theories and experiments: (1) Ultrasonic attenuation of a void-containing medium, (2) the elastic constants of a solid containing spherical holes. (3) damage rate approach, and (4) creep damage assessment by density change measurement.
By the developed method, it became possible to describe approximately the attenuation and velocity changes with increasing creep damage.