Effects of inclined incidence on ultrasonic testing of a closed crack

Tatsuhiro Okamoto, Kenji Kurihara, Toshihiko Sugiura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publication2012 IEEE International Ultrasonics Symposium, IUS 2012
Pages1445-1448
Number of pages4
DOIs
Publication statusPublished - 2012 Dec 1
Event2012 IEEE International Ultrasonics Symposium, IUS 2012 - Dresden, Germany
Duration: 2012 Oct 72012 Oct 10

Publication series

NameIEEE International Ultrasonics Symposium, IUS
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727

Other

Other2012 IEEE International Ultrasonics Symposium, IUS 2012
CountryGermany
CityDresden
Period12/10/712/10/10

Keywords

  • Closed Crack
  • Nonlinear Ultrasonics
  • Subharmonic
  • Ultrasonic Testing

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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  • Cite this

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