Two-dimensional analysis of subharmonic ultrasound generation at closed cracks by damped double nodes

Kazushi Yamanaka, Yohei Shintaku, Miyuki Oguma, Yoshikazu Ohara

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

Abstract

Evaluation of closed cracks is the most serious issue for safety of important structures such as power plants or air planes. To overcome the problem, subharmonics in nonlinear ultrasound is particularly useful because of the excellent selectivity for closed cracks and high temporal resolution, which has been verified by the subharmonic phased array for crack evaluation (SPACE), developed by the authors. In this study, we propose the first two dimensional (2D) model to reproduce subharmonic generation at closed cracks using damped double nodes (DDN). Numerical simulation using finite difference time domain (FDTD) method was performed using DDN and time frequency analysis was performed based on the wavelet analysis. The results were able to reproduce essential features observed in the experiments.

Original languageEnglish
Title of host publicationNDT in Progress 2011 - 6th International Workshop of NDT Experts, Proceedings
EditorsPavel Mazal
PublisherBrno University of Technology
Pages327-332
Number of pages6
ISBN (Electronic)9788021443396
Publication statusPublished - 2011 Jan 1
Event6th International Workshop NDT in Progress 2011 - Prague, Czech Republic
Duration: 2011 Oct 102011 Oct 12

Publication series

NameNDT in Progress 2011 - 6th International Workshop of NDT Experts, Proceedings

Other

Other6th International Workshop NDT in Progress 2011
CountryCzech Republic
CityPrague
Period11/10/1011/10/12

Keywords

  • Closed Crack
  • Double Node
  • FDTD
  • Nonlinear
  • Subharmonic
  • Ultrasonic Testing (UT)

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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