Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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FEM Model-Based Investigation of Ultrasonic TOFD for Notch Inspection

  • Tang, Ziqiao (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Yuan, Maodan (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Wu, Hu (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Zhang, Jianhai (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Kim, Hak-Joon (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Song, Sung-Jin (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Kang, Sung-Sik (Korea Institute of Nuclear Safety)
  • Received : 2013.12.05
  • Accepted : 2014.01.07
  • Published : 2014.02.28
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Abstract

A two-dimensional numerical model based on the finite element method was built to simulate the wave propagation phenomena that occur during the ultrasonic time of flight diffraction (TOFD) process. First, longitudinal-wave TOFD was simulated, and the numerical results agreed well with the theoretical results. Shear-wave TOFD was also investigated because shear waves have higher intensity and resolution. The shear wave propagation was studied using three models with different boundary conditions, and the tip-diffracted shear-to-longitudinal wave was extracted from the A-scan signal difference between the cracked and non-cracked specimens. This signal showed very good agreement between the geometrical and numerical arrival times. The results of this study not only provide better understanding of the diffraction phenomena in TOFD, but also prove the potential of shear-wave TOFD for practical application.

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References

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