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초록
This study proposes a fully non-contact measurement method to assess acoustic nonlinearity of narrowband surface waves generated by a line-arrayed laser beam by using a laser-ultrasonic detector in the way of two-wave mixing(TWM) method. This method was applied to figure out a relationship between plastic deformation and nonlinearity characteristics of a plastically deformed aluminum specimens. The experimental results showed that the acoustic nonlinearity of the laser-generated surface wave increased proportionally to the level of tensile deformation. This tendency is in good agreement with the result of measurement by contact method with PZT-transducer.
키워드
Acoustic Nonlinearity; Laser-generated Surface Wave; Laser Ultrasound Detector; Two-wave Mixing; 음향비선형성; 레이저 여기 표면파; 레이저 초음파 수신 TWM
- 제목
- Al6061 합금의 소성변형에 따른 음향비선형 특성의 완전 비접촉식 평가
- 제목 (타언어)
- Fully Non-Contact Assessment of Acoustic Nonlinearity According to Plastic Deformation in Al6061 Alloy
- 저자
- 이현; 전청; 김정석; 장경영
- 발행일
- 2012-08
- 저널명
- 비파괴검사학회지
- 권
- 32
- 호
- 4
- 페이지
- 388 ~ 392