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http://www.dbpia.co.kr/Journal/ArticleDetail/3206676


비파괴검사학회지 제33권 제2호, 2013.4, 193-197 (5 pages)

열처리된 알루미늄 합금의 초음파 비선형 특성 평가

Evaluation of Ultrasonic Nonlinear Characteristics in Heat-Treated Aluminum Alloy

한국어 초록
  본 연구에서는 열처리된 알루미늄 합금의 초음파 비선형 특성을 평가하였다. 초음파의 비선형성은 재료를 전파한 초음파의 2차고조파와 기본주파수 성분의 진폭비에 의존하는 비선형 파라미터 β로 측정하였다. 비선형 파라미터 β의 측정은 접촉식 탐촉자를 이용하여 동일 평면상에서 시편저면에서 반사된 신호로부터 구하였다. 열처리(시효)는 300℃에서 1시간부터 50시간까지 다양한 유지시간동안 수행하였다. 인장시험으로부터 인장강도와 연신율을 구하고 비선형 파라미터와 비교하였다. 비선형 파라미터 β는 시효시간 5시간에서 피크를 나타내고 이후는 감소하였다. 이는 인장강도와 연신율의 변화와 밀접한 관련이 있는 것으로 나타났다. 또한 비선형 파라미터가 피크를 나타낸 열처리 시간과 인장곡선에서 최대변화가 나타난 열처리 시간이 일치하였다. 이 같은 결과는 알루미늄합금의 시효처리로 인한 강도 변화를 모니터링 하는데 초음파의 비선형성이 유용할 수 있음을 보여준다.
영어 초록
  In this study, ultrasonic nonlinear characteristics in the heat-treated aluminum alloy have been evaluated. The nonlinearity of ultrasonic wave has been measured as the acoustic nonlinear parameter β, depending upon the amplitude ratio of the second-order harmonic and the fundamental frequency component of ultrasonic wave propagating through the materials. The parameter β measurement has been carried out with the reflected signals from the back-wall of specimens at the same plane using the contact-type transducers. The heat-treatment, aging, has been achieved at 300 for various durations in the range of 1 to 50 hours. The tensile strength and elongation are obtained by the tensile test and then compared with the parameter β. There is a peak of the acoustic nonlinear parameter β on 5 hours aging and the β decreases thereafter, exhibiting closed relations with tensile strength and elongation. Also, the heat-treatment time showing peak in the parameter β was identical to that showing severe change in the σ-ε curve. These results suggest that the acoustic nonlinear parameter β can be used for monitoring the strength variations with aging of aluminum alloys.
목차
초록
Abstract
1. 서론
2. 음향 비선형 파라미터
3. 실험
4. 실험결과
5. 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/3206676 복사 즐겨찾기로 추가

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