Effects of inclined incidence on ultrasonic testing of a closed crack

Tatsuhiro Okamoto, Kenji Kurihara, Toshihiko Sugiura

研究成果: Conference contribution

2 引用 (Scopus)

抜粋

Detection and sizing of a closed crack are difficult by the conventional ultrasonic testing, because ultrasonic waves propagate through a closed crack. Recently, the nonlinear ultrasonic testing using superharmonics and/or subharmonics is regarded as a remarkable method of detecting a closed crack. However, the mechanism of subharmonics generation by a closed crack is not clear yet. In this study, we investigated propagation of inclined incident ultrasonic waves through a closed crack and introduced a two-dimensional model with reference of a one-dimensional model which we had introduced in our previous study (Kurihara, et al, 2011). In our experiments, after first finding natural frequencies from frequency response curves, we analyzed received signals obtained under the excitation frequencies twice the natural frequencies, using the Wavelet transformation. From the experimental results, subharmonics generation as well as the natural frequencies were influenced by the incident angles and the compression forces. Considering these results, we introduced a two-dimensional model with nonlinear springs. This model gives us numerical results corresponding with the experimental ones. Consequently, this two-dimensional model can be essential to understand the mechanism of subharmonics generation at a closed crack under inclined incidence of ultrasonic waves.

元の言語English
ホスト出版物のタイトル2012 IEEE International Ultrasonics Symposium, IUS 2012
ページ1445-1448
ページ数4
DOI
出版物ステータスPublished - 2012 12 1
イベント2012 IEEE International Ultrasonics Symposium, IUS 2012 - Dresden, Germany
継続期間: 2012 10 72012 10 10

出版物シリーズ

名前IEEE International Ultrasonics Symposium, IUS
ISSN(印刷物)1948-5719
ISSN(電子版)1948-5727

Other

Other2012 IEEE International Ultrasonics Symposium, IUS 2012
Germany
Dresden
期間12/10/712/10/10

    フィンガープリント

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

これを引用

Okamoto, T., Kurihara, K., & Sugiura, T. (2012). Effects of inclined incidence on ultrasonic testing of a closed crack. : 2012 IEEE International Ultrasonics Symposium, IUS 2012 (pp. 1445-1448). [6562404] (IEEE International Ultrasonics Symposium, IUS). https://doi.org/10.1109/ULTSYM.2012.0361