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Related Experiment Videos

Image-based sizing of surface-breaking cracks by SH-wave array ultrasonic testing.

K Kimoto1, S Ueno, S Hirose

  • 1Department of Mechanical and Environmental Informatics, Graduate School of Information Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, Japan. kimoto@cv.titech.ac.jp <kimoto@cv.titech.ac.jp>

Ultrasonics
|September 29, 2006
PubMed
Summary
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This study introduces novel ultrasonic imaging methods for accurately measuring surface-breaking cracks without calibration. These techniques, using anti-plane shear waves, effectively locate crack tips and estimate depths, even for fatigue cracks under varying loads.

Area of Science:

  • Materials Science
  • Non-Destructive Testing
  • Acoustics

Background:

  • Accurate characterization of surface-breaking cracks is crucial for structural integrity assessment.
  • Traditional ultrasonic crack sizing often requires extensive calibration, limiting its practical application.
  • The behavior of fatigue cracks under load, including opening and closing, complicates in-situ monitoring.

Purpose of the Study:

  • To develop and validate calibration-free ultrasonic imaging techniques for sizing 2D surface-breaking cracks.
  • To adapt Synthetic Aperture Focusing Technique (SAFT) and Computed Time-Reversal Focusing Technique (TRFT) for direct crack tip localization.
  • To assess the performance of these techniques on both artificial slits and real fatigue cracks.

Main Methods:

Related Experiment Videos

  • Utilized anti-plane shear waves (SH-waves) for crack interrogation.
  • Modified SAFT and TRFT algorithms to directly process A-scope waveforms for crack tip detection.
  • Performed ultrasonic measurements on slits with known dimensions and fatigue cracks under varying external loads.

    • Main Results:

    • Achieved accurate sizing of slits and fatigue cracks using the developed SAFT and TRFT methods.
    • Demonstrated successful crack tip localization directly from A-scope data without prior calibration.
    • Observed the appearance and disappearance of crack tip indicators corresponding to crack opening and closing under load.

    Conclusions:

    • The proposed calibration-free ultrasonic imaging techniques offer a reliable and efficient approach for sizing surface-breaking cracks.
    • These methods accurately estimate crack depths and can monitor crack opening/closing behavior.
    • The techniques show significant potential for practical non-destructive evaluation applications in various industries.