| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a non-destructive evaluation method of a degree of metal fatigue damage capable of measuring an accurate degree of metal fatigue in a short time, and an ultrasonic metal fatigue damage degree measuring instrument having a simple structure and a small size and also excellent in portability. Ž<P>SOLUTION: The ultrasonic metal fatigue damage degree measuring instrument is equipped with a transmitter 14 brought into contact with the surface of a metal material 12 to transmit an ultrasonic wave, a receiver 16 for receiving the ultrasonic wave propagated along the surface of the metal material 12 and a body part 20 for separating the transmitter 14 and the receiver 16 at a definite interval to integrally hold them. The sound pressure attenuation ratio or propagation time of the ultrasonic wave propagated in the vicinity of the surface of the metal material 12 is measured, and the metal fatigue degree of the metal material 12 is calculated from the relation of the sound pressure attenuation ratio or propagation data of the ultrasonic wave to a known metal fatigue degree. An SH wave used as the ultrasonic wave and a metal member is intended for the metal material having a hexagonal crystal structure such as a magnesium alloy. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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