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Improvement of crack sizing performance by using nonlinear ultrasonic technique

  • Hogeon Seo
  • Kyung-Young Jhang
  • Kyung-Cho Kim
  • Dong-Pyo Hong
Short Communication

Abstract

The nonlinear ultrasonic technique (NUT) based on the contact acoustic nonlinearity (CAN) has been considered as a promising method for the closed crack detection. However, most of the previous studies were limited to the modeling of the second-order harmonic wave generation at contacted interfaces and its verification by testing artificially contacted interfaces in the through-transmission method. In this study, we investigated experimentally the contact acoustic nonlinearity at a real crack by using the measurement system constructed in the pitch-catch method that permits the transducers to access the only single side of a test structure. Results showed that the magnitude of the second-order harmonic wave represented the existence of the closed area clearly and that the crack sizing performance was greatly improved by the combination of the linear and nonlinear ultrasonic techniques.

Keywords

Crack sizing Contact interface Contact Acoustic Nonlinearity (CAN) Harmonic wave generation Pitch-catch method 

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Copyright information

© Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Hogeon Seo
    • 1
  • Kyung-Young Jhang
    • 2
  • Kyung-Cho Kim
    • 3
  • Dong-Pyo Hong
    • 4
  1. 1.Department of Mechanical Convergence EngineeringHanyang UniversitySeoulSouth Korea
  2. 2.School of Mechanical EngineeringHanyang UniversitySeoulSouth Korea
  3. 3.Korea Institute of Nuclear SafetyDaejeonSouth Korea
  4. 4.School of Mechanical System EngineeringChonbuk National UniversityJeonjuSouth Korea

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