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Nonlinear Time Reversal Focusing and Detection of Fatigue Crack
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  • Nonlinear Time Reversal Focusing and Detection of Fatigue Crack
  • Nonlinear Time Reversal Focusing and Detection of Fatigue Crack
저자명
Jeong. Hyun-Jo,Barnard. Dan
간행물명
비파괴검사학회지
권/호정보
2012년|32권 4호|pp.355-361 (7 pages)
발행정보
한국비파괴검사학회
파일정보
정기간행물|ENG|
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기타
이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

This paper presents an experimental study on the detection and location of nonlinear scattering source due to the presence of fatigue crack in a laboratory specimen. The proposed technique is based on a combination of nonlinear elastic wave spectroscopy(NEWS) and time reversal(TR) focusing approach. In order to focus on the nonlinear scattering position due to the fatigue crack, we employed only one transmitting transducer and one receiving transducer, taking advantage of long duration of reception signal that includes multiple linear scattering such as mode conversion and boundary reflections. NEWS technique was then used as a pre-treatment of TR for spatial focusing of reemitted second harmonic signal. The robustness of this approach was demonstrated on a cracked specimen and the nonlinear TR focusing behavior is observed on the crack interface from which the second harmonic signal was originated.