Journal of Wind Energy (풍력에너지저널)

Korea Wind Energy Association (한국풍력에너지학회)
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Evaluation of Fracture Toughness Characteristics of Pultruded CFRP Spar-Cap Materials with Non-woven Glass Fabric for Wind Blade

유리섬유 부직포가 삽입된 풍력 블레이드 인발 성형 스파캡 소재의 파괴인성 특성 평가

  • Young Cheol Kim ;
  • Geunsu Joo ;
  • Jisang Park ;
  • Woo-Kyoung Lee ;
  • Min-Gyu Kang ;
  • Ji Hoon Kim
  • 김영철 (한국재료연구원, 복합재료구조시스템연구실) ;
  • 주근수 (한국재료연구원, 복합재료구조시스템연구실) ;
  • 박지상 (한국재료연구원, 복합재료구조시스템연구실) ;
  • 이우경 (한국재료연구원, 복합재료구조시스템연구실) ;
  • 강민규 (한국재료연구원, 복합재료구조시스템연구실) ;
  • 김지훈 (부산대학교, 기계공학부 정밀가공시스템 전공)
  • Received : 2023.06.07
  • Accepted : 2023.09.01
  • Published : 2023.09.30
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Abstract

The purpose of this study is to evaluate the inter-laminar fracture toughness characteristics of CFRP pultrusion spar cap materials reinforced with non-woven glass fabric. Test specimens were fabricated by the infusion technique. A non-woven glass fabric and artificial defects were embedded on the middle surface between two pultruded CFRP panels. Double cantilever beam (DCB) and End Notched Flexure (ENF) tests were performed according to ASTM standards. Fracture toughness and crack propagation characteristics were evaluated with load-displacement curves and delamination resistance curves (R-Curve). The fracture toughness results were calculated by compliance calibration (CC) method. The initiation and propagation values of Mode-I critical strain energy release rate value GIc were 1.357 kJ/m2 and 1.397 kJ/m2, respectively, and Mode-II critical strain energy release rate values GIIc were 4.053 kJ/m2 for non-precracked test and 4.547 kJ/m2 for precracked test. It was found that the fracture toughness properties of the CFRP pultrusion spar-cap are influenced by the interface between the layers of CFRP and glass fiber non-woven.

Keywords

Acknowledgement

본 연구는 산업통상자원부의 재원으로 한국에너기술평가원의 지원을 받아 수행한 신재생에너지핵심기술개발사업(No. 20213030020120)의 연구 결과입니다.

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