Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4925158 | NDT & E International | 2017 | 29 Pages |
Abstract
In measuring crack depths by ultrasonic testing, there are two difficulties; crack closure and coarse grains. Crack closure can cause the underestimation or miss-detection. Coarse grains can hide crack tip responses due to strong linear scatterings at coarse grains. To solve these problems, a combination of a crack opening method, global preheating and local cooling (GPLC) and a high-selectivity imaging method, load difference phased array (LDPA) was proposed. However, it has yet to be verified. Here we formed a tightly closed fatigue crack in a coarse-grained stainless-steel specimen using a stepwise-decremental method. In the specimen, we demonstrated that our method is useful in selectively imaging closed cracks in coarse-grained materials.
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Physical Sciences and Engineering
Engineering
Civil and Structural Engineering
Authors
Yoshikazu Ohara, Koji Takahashi, Yoshihiro Ino, Kazushi Yamanaka, Toshihiro Tsuji, Tsuyoshi Mihara,