Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
권호 표지

Fiber Volume Fraction Measurement of Fiber Reinforced Plastics by Using Gamma-Ray

감마선을 이용한 복합재료의 섬유체적분율 측정

  • Jang, J.H. (NDE Group, Korea Institute of Machinery & Materials) ;
  • Cho, K.S. (NDE Group, Korea Institute of Machinery & Materials) ;
  • Chang, H.K. (NDE Group, Korea Institute of Machinery & Materials) ;
  • Park, J.H. (NDE Group, Korea Institute of Machinery & Materials) ;
  • Lee, J.O. (ANI Center, Korea Institute of Machinery & Materials)
  • 장지훈 (한국기계연구원 비파괴시험그룹) ;
  • 조경식 (한국기계연구원 비파괴시험그룹) ;
  • 장홍근 (한국기계연구원 비파괴시험그룹) ;
  • 박지홍 (한국기계연구원 비파괴시험그룹) ;
  • 이종오 (한국기계연구원 원자력공인검사사업단)
  • Published : 1997.08.05
Download PDF
⟨ Previous Next ⟩

Abstract

In this research, nondestructive test using a radioisotope, $^{241}Am$ gamma-ray, was accomplished in order to evaluate the fiber volume fraction of the accumulated composite layers such as glass fiber/epoxy and carbon fiber/epoxy. Attenuation coefficients of the fiber and resin were measured respectively by NaI(T1) detector The fibers volume fraction was measured for various thickness of composite layers between 2 and 20mm. Fiber volume fraction of the composite layers were also measured for various amount of fibers. The experimental errors from nondestructive test using gamma-ray were in the range of ${\pm}1{\sim}2.5%$ in comparison with those from observation by optical microscopy. By selecting the optimum energy and activity of radioisotope, this method can provide a new means for the evaluation of the fiber volume fraction.

본 연구에서는 방사성동위원소 $^{241}Am$의 감마선 감쇠를 이용하여 유리섬유 및 탄소섬유 복합적층판의 섬유체적분율을 비파괴적으로 측정하였다. NaI(Tl) detector에 의해 섬유와 기지의 방사선 감쇠계수를 측정하고, 시험체의 두께를 $2{\sim}20mm$로 변화시키면서 섬유체적분율을 측정하였으며, 적층판과 에폭시판을 겹쳐서 섬유체적분율을 변화시키면서 섬유체적분율을 측정하였다. 연구 결과 단면을 현미경으로 관찰하여 구해진 값과 비교 할 때 오차 ${\pm}1{\sim}2.5%$ 범위 이내로 측정이 가능하였으며, 방사선원의 energy, activity의 선택에 따라서 대부분의 복합재료에 적용이 가능할 것으로 판단된다.

Keywords