構造工学論文集 A
Online ISSN : 1881-820X
鋼構造・橋:論文
疲労き裂面の接触状態による透過超音波の波形特性の変化
中畑 和之高橋 栞太細川 隼人高橋 学
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2020 年 66A 巻 p. 529-539

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In the case that the fatigue crack face is contacted due to the stress condition, un-derestimation or overlook of the crack might happen in ultrasonic testing. To cope with such a crack closure problem, the nonlinear ultrasonic method is immensely promising. The contact and non-contact behaviors of crack faces generate super-and sub-harmonics arising from interactions with large amplitude incident waves. In this study, an attempt has been made to evaluate fatigue cracks in a structural components using ultrasonic waveforms traveling a long distance. Here, the ultra-sonic waves transmitted through the fatigue crack in a steel specimen were measured while changing the contact state of the crack face. The properties of the measured signals were investigated by comparing to numerical modeling results.

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