Smart Structures and Systems

  • 제25권3호
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  • Pages.301-310
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  • 2020
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Crack localization by laser-induced narrowband ultrasound and nonlinear ultrasonic modulation

  • Liu, Peipei (Department of Civil and Environmental Engineering, Korean Advanced Institute for Science and Technology) ;
  • Jang, Jinho (Department of Civil and Environmental Engineering, Korean Advanced Institute for Science and Technology) ;
  • Sohn, Hoon (Department of Civil and Environmental Engineering, Korean Advanced Institute for Science and Technology)
  • 투고 : 2019.10.30
  • 심사 : 2019.12.27
  • 발행 : 2020.03.25
⟨ 이전 논문 다음 논문 ⟩

초록

The laser ultrasonic technique is gaining popularity for nondestructive evaluation (NDE) applications because it is a noncontact and couplant-free method and can inspect a target from a remote distance. For the conventional laser ultrasonic techniques, a pulsed laser is often used to generate broadband ultrasonic waves in a target structure. However, for crack detection using nonlinear ultrasonic modulation, it is necessary to generate narrowband ultrasonic waves. In this study, a pulsed laser is shaped into dual-line arrays using a spatial mask and used to simultaneously excite narrowband ultrasonic waves in the target structure at two distinct frequencies. Nonlinear ultrasonic modulation will occur between the two input frequencies when they encounter a fatigue crack existing in the target structure. Then, a nonlinear damage index (DI) is defined as a function of the magnitude of the modulation components and computed over the target structure by taking advantage of laser scanning. Finally, the fatigue crack is detected and localized by visualizing the nonlinear DI over the target structure. Numerical simulations and experimental tests are performed to examine the possibility of generating narrowband ultrasonic waves using the spatial mask. The performance of the proposed fatigue crack localization technique is validated by conducting an experiment with aluminum plates containing real fatigue cracks.

키워드

과제정보

연구 과제 주관 기관 : National Research Foundation of Korea (NRF)

This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1C1C1009493), and also a National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1A3B3067987).

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