High-selectivity imaging of closed cracks in a coarse-grained stainless steel by nonlinear ultrasonic phased array

Yoshikazu Ohara, Koji Takahashi, Yoshihiro Ino, Kazushi Yamanaka, Toshihiro Tsuji, Tsuyoshi Mihara

研究成果: Article査読

15 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)139-147
ページ数9
ジャーナルNDT and E International
91
DOI
出版ステータスPublished - 2017 10

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 機械工学

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