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지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 국제구조공학회 Smart Structures and Systems, An International Journal Smart Structures and Systems, An International Journal Vol.25 No.3
- 발행연도
- 2020.1
- 수록면
- 301 - 310 (10page)
이용수
초록· 키워드
오류제보하기
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.
목차
등록된 정보가 없습니다.
참고문헌 (40)
참고문헌 신청
An, Y. K. / 2013 / Complete noncontact laser ultrasonic imaging for automated crack visualization in a plate / Smart Mater. Struct 22(2):025022
Yun-Kyu An / 2013 / Noncontact laser ultrasonic crack detection for plates with additional structural complexities / Structural Health Monitoring: An International Journal 12(5-6):522~538
Kevin C Baldwin / 1999 / Narrowband laser generation/air-coupled detection: ultrasonic system for on-line process control of composites / Ultrasonics 37(5):329~334
Davies, S. / 1993 / Laser-generated ultrasound : Its properties, mechanisms and multifarious applications / J. Phys. D Appl. Phys 26(3):329~348
J. B. Deaton / 1990 / Generation of narrow‐band ultrasound with a long cavity mode‐locked Nd:YAG laser / Applied Physics Letters 56(24):2390~2392
Yun-Kyu An / 2013 / Noncontact laser ultrasonic crack detection for plates with additional structural complexities / Structural Health Monitoring: An International Journal 12(5-6):522~538
Kevin C Baldwin / 1999 / Narrowband laser generation/air-coupled detection: ultrasonic system for on-line process control of composites / Ultrasonics 37(5):329~334
Davies, S. / 1993 / Laser-generated ultrasound : Its properties, mechanisms and multifarious applications / J. Phys. D Appl. Phys 26(3):329~348
J. B. Deaton / 1990 / Generation of narrow‐band ultrasound with a long cavity mode‐locked Nd:YAG laser / Applied Physics Letters 56(24):2390~2392
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