構造工学論文集 A
Online ISSN : 1881-820X
鋼構造・橋:論文
高感度磁気非破壊検査による疲労き裂の検出の試み
大西 泰生石川 敏之塚田 啓二
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ジャーナル フリー

2021 年 67A 巻 p. 479-487

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The purpose of this study is to detect weld toe cracks generated in out-of-plane gusset welding due to plate bending fatigue test by high-sensitivity magnetic non-destructive inspection (ELECT). It was shown that the difference magnetic vector obtained via subtraction of a magnetic vector of frequency 3 Hz from that of 40 Hz becomes smaller when the fatigue crack propagates. From the ELECT measurement results of the main plate, it can be assumed that the fatigue crack initiates and propagates when the difference vector intensity ratio of sensors 1 and 2 becomes less than 1.

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