J0402-1-2 電磁超音波共鳴法を用いた炭素鋼の片振疲労中の超音波減衰の変化([J0402-1]超音波計測・解析法の新展開(1))

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In this study, we evaluated the evolution of the ultrasonic attenuation and velocity in a carbon steel, subjected to zero-to-tension cyclic loading, by monitoring of ultrasonic characteristics, using EMAR (Electromagnetic Acoustic Resonance), which is a contactless resonant method with the use of an EMAT and is free from extra energy losses, resulting in the measurement of intrinsic attenuation in solids. We launched polarized shear wave in the thickness direction of the plate sample to obtain the ultrasonic velocity from the resonant frequency and the attenuation coefficient from the ring-down curve at resonance. Ultrasonic attenuation was more sensitivity than velocity and showed a peak at 10% of the total life. This phenomenon is not depend on amplitude of stress range EMAR method has possibility of predicting the remaining life of a metal and metal fatigue breakdown.
2010-09-04