Non-Destructive Evaluation of Internal Crack in Thin Sheet by Using Laser Induced Ultrasonic Waves

DOI Web Site Web Site 1 Citations 24 References
  • Ikeda S.
    Graduate School of Engineering, The University of Tokyo
  • Ito K.
    Graduate School of Engineering, The University of Tokyo
  • Nambu S.
    Graduate School of Engineering, The University of Tokyo
  • Enoki M.
    Graduate School of Engineering, The University of Tokyo

Bibliographic Information

Other Title
  • レーザー誘起超音波を用いた薄板中の内部き裂の非破壊評価
  • レーザー ユウキ チョウオンパ オ モチイタ ハクバン チュウ ノ ナイブ キレツ ノ ヒハカイ ヒョウカ

Search this article

Abstract

  A novel, noncontact, non-destructive evaluation technique for thin sheet specimens which may have internal cracks is drawing attention. In this technique, pulsed lasers generate ultrasonic waves on the surface of specimen, and an interferometer is used to measure the waves of the surface of specimen. Correlation between laser induced ultrasonic waves and size of internal cracks was investigated. Resin specimens with various size and location of internal cracks were prepared, and ultrasonic waves generated by YAG pulsed laser were measured by He-Ne laser interferometer. Results of FEM analysis and natural frequencies of flexural vibration were used to compare with the results of experiments. As a result, this method could detect location of cracks by using correlation coefficient and FFT peak frequency, and there were correlations between induced ultrasonic waves and size of internal cracks. This method was applied to inspect multi-layered-steel specimens with interlayer cracks.<br>

Journal

Citations (1)*help

See more

References(24)*help

See more

Related Projects

See more

Keywords

Details 詳細情報について

Report a problem

Back to top