Proceedings of the Korean Society For Composite Materials Conference (한국복합재료학회:학술대회논문집)
- 2004.10a
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- Pages.254-257
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- 2004
On Characterization for Stacking Fault Evaluation of CF/Epoxy Composite Laminates Using an EMAT Ultrasonics
전자기 초음파를 이용한 CF/Epoxy 복합적층판의 적층결함 특성평가
- Im Kwanghee ;
- Na Seungwoo ;
- Hsu David K. ;
- Lee Changro ;
- Park Jewoung ;
- Sim Jaeki ;
- Yang Inyoung
- 임광희 (우석대학교 반도체전기자동차공학부) ;
- 나승우 (순천제일대학 차량기계과) ;
- ;
- 이창노 (우석대학교 반도체전기자동차공학부) ;
- 박제웅 (조선대학교 공과대학) ;
- 심재기 (조선대학교 공과대학) ;
- 양인영 (조선대학교 공과대학)
- Published : 2004.10.01
Abstract
An electromagnetic acoustic transducers (EMAT) can usually generate or detect an ultrasonic wave into specimens across a small gap. Especially stiffness of composites depends on layup sequence of CFRP(carbon fiber reinforced plastics) laminates because the layup of composite laminates influences there properties. It is very important to evaluate the layup errors in prepreg laminates. A nondestructive technique can therefore serve as a useful measurement for detecting layup errors. It was shown experimentally that this shear waves for detecting the presence of the errors is very sensitive. It is found that high probability shows between tests and the model developed in characterizing cured layups of the laminates. Also a C-scan method was used for detecting layup of the laminates because of extracting fiber orientation information from the ultrasonic reflection caused by structural imperfections in the laminates. Therefore, it was found that interface C-scan images show the fiber orientation information by using two-dimensional fast Fourier transform(2-D FFT).