한국항공우주학회지 (Journal of the Korean Society for Aeronautical & Space Sciences)

  • 제50권5호
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  • Pages.309-316
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  • 2022
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  • 1225-1348(pISSN)
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  • 2287-6871(eISSN)
한국항공우주학회 (The Korean Society for Aeronautical and Space Sciences)
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다양한 적층을 갖는 CFRP 적층판의 인장강도 예측

Estimating Tensile Strengths of CFRP Laminates Having Various Stacking Sequences

  • Park, Chan Yik (Aerospace Technology Research Institute, Agency for Defense Development) ;
  • Lee, Myung-Keon (Aerospace Technology Research Institute, Agency for Defense Development) ;
  • Kim, Sang-Yong (Aerospace Technology Research Institute, Agency for Defense Development) ;
  • Jang, Se-Yong (Aerospace Technology Research Institute, Agency for Defense Development)
  • 투고 : 2022.01.27
  • 심사 : 2022.03.29
  • 발행 : 2022.05.01
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⟨ 이전 논문 다음 논문 ⟩

초록

본 논문에서는 14개의 다른 적층을 갖는 CFRP 적층판의 강도를 비선형 수치해석으로 계산하고 시험 결과와 비교하였다. 복합재 적층판 쿠폰은 일방향 테이프로 만들어진 프리프레그를 오토클레이브에서 경화하여 제작하였다. 라미나 시험으로 획득한 메트릭스의 비선형 특성을 해석에 고려하였다. Hashin 파손조건과 점진적 손상모델을 사용하여 비선형 유한요소 해석을 수행하였다. 비교 결과 본 논문의 접근 방법이 다양한 적층을 갖고, 손상이 없는 CFRP 적층판의 인장강도를 예측할 수 있음을 보여주었다. 그러나 구멍이 있는 적층판 시편의 강도 예측에는 부적합하였다.

This paper presents nonlinear numerical analysis results which were compared with the tested tensile strengths of CFRP(Carbon Fiber Reinforced Plastic) laminates with 14 different stacking sequences. The composite laminate coupons were cured under an autoclave pressure using resin-impregnated unidirectional tapes. The nonlinearity of the matrix was considered for the analysis, which was obtained from lamina tests. The Hashin failure criteria and progressive failure analysis were used for the nonlinear finite element analysis. The comparison results show that the current approach is acceptable to predict the tensile strengths of the CFRP laminate coupons with various stacking sequences and no damage. However, it is not acceptable to predict the tensile strengths of the laminate specimens with a center hole.

키워드

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