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http://www.dbpia.co.kr/Journal/ArticleDetail/3461641


한국비파괴검사학회 > 비파괴검사학회지 > 비파괴검사학회지 제34권 제3호


비파괴검사학회지 제34권 제3호, 2014.6, 226-232 (7 pages)

어블레이션 영역 레이저 초음파의 시뮬레이션과 내부결함 검사

Simulations for Internal Defect Inspection Using Laser Generated Ultrasonic Wave in Ablation Regime
김진겸, 최성호, 장경영
한국어 초록
  본 연구에서는 고출력 레이저를 재료 표면에 조사하였을 때 나타나는 어블레이션 현상에 의한 레이저 초음파의 특성을 시뮬레이션과 실험을 통해 분석하였다. 레이저 초음파 기법은 비파괴검사 분야에서 기존의 접촉식 초음파 기법을 적용하기 어려운 환경요인(고온 등)을 극복할 수 있는 장점들을 가지고 있다. 특히, 어블레이션 영역에서는 종파의 신호 세기 및 직진성이 강하므로, 투과 및 반사 신호를 통한 내부결함 검사법으로 활용하기 적합하다. 본 논문에서는 유한요소해석을 통해 어블레이션 영역에서의 레이저 초음파의 발생 및 전파를 해석하였다. 그리고 개발된 유한요소해석 모델을 활용해 결함모사시편을 대상으로 B-Scan을 수행한 결과, 실험 결과와 동일하게 나타나는 것을 확인하였고, 이로부터 개발된 해석모델의 타당성을 검증할 수 있었다.
영어 초록
  In the present study, the characteristics of laser ultrasound in the ablation regime are investigated using simulations and experiments. The laser ultrasonic technique has been recognized as a noncontact method in the field of nondestructive tests (NDTs). In hostile environments (such as hot temperatures), this method has various advantages over the conventional contact ultrasonic method. In particular, in the ablation regime, the laser ultrasonic technique is suitable for inspecting internal defects because of the high amplitude and directivity of the longitudinal wave. In this paper, a simulation model for laser ultrasound in the ablation regime was developed. This model was subsequently applied to a defective specimen using the B-scan method to locate defects. Finally, we performed an experimental test to verify the simulation results. Consequently, the simulation demonstrated good agreement with the experimental test.
목차
초록
Abstract
1. 서론
2. 레이저 초음파
3. 유한요소해석 모델
4. 해석 모델 검증
5. 내부결함 검출에의 적용
6. 실험장치 구성
7. 실험 결과
8. 결론
참고문헌
키워드상세서지
  • 발행기관 : 한국비파괴검사학회
  • 자료유형 : 전자저널 논문
  • 등재정보 : KCI 등재
  • 작성언어 : 한국어
  • 파일형식 : Text PDF
  • KORMARC 보기
  • URL : http://www.dbpia.co.kr/Article/3461641 복사 즐겨찾기로 추가

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