Performance of non-destructive evaluation by diffracted SH ultrasonic waves in predicting degree of fatigue in cyclic bending of ferritic steel |
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| Authors: | Mikio Fukuhara Yoshiyuki Kuwano Kiyoshi Saito Taiji Hirasawa Ichiro Komura |
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| Affiliation: | aTechnical Research Laboratory, Toshiba Tungaloy, Kokusai-Shinkawasaki Bld, 1-50, 2 Chome, Kitakase, Saiwai-ku, Kawasaki 211, Japan;bHeavy Apparatus Engineering Laboratory, Toshiba 9, 1 Chome, Suehiro, Tsurumi-ku, Yokohama 230, Japan |
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| Abstract: | The degree of fatigue in ferritic wrought steel during cyclic bending was determined by analysis of diffracted SH ultrasonic waves with the aid of multiple regression analysis. As the degree of fatigue increases, accompanied by residual stress, the incident waves curve to the interior region with positive stress field owing to the acoustoelastic effect. As a result, the propagation time of the launched waves lengthens, leading to a modulation of the received waveform. Multiple regression analysis for the waveform modulation produces a reliable estimation, with correlation coefficient of 0.948, for the degree of fatigue. |
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| Keywords: | fatigue prediction SH ultrasonic waves ferritic steel |
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