Composites Research

  • 제28권4호
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  • Pages.212-218
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  • 2015
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  • 2288-2103(pISSN)
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  • 2288-2111(eISSN)
한국복합재료학회 (The Korean Society for Composite Materials)
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AFP로 제작된 두꺼운 복합재료 스파의 제작 및 구조 해석

Manufacturing and Structural Analysis of Thick Composite Spar Using AFP Machine

  • Kim, Ji-Hyeon (School of Mechanical and Aerospace Engineering, Gyeongsang National University) ;
  • Han, Jun-Su (Aerospace center, Gyeongnam Technopark) ;
  • Bae, Byung-Hwan (Aero-structure Production Engineering Section, Korea Aerospace Industries) ;
  • Choi, Jin-Ho (School of Mechanical and Aerospace Engineering, Gyeongsang National University) ;
  • Kweon, Jin-Hwe (School of Mechanical and Aerospace Engineering, Research Center for Aircraft Parts Technology, Gyeongsang National University)
  • 투고 : 2015.08.20
  • 심사 : 2015.08.27
  • 발행 : 2015.08.31
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초록

본 연구에서는 AFP 장비를 이용하여 대형 복합재 스파 구조를 제작하고, 스파 구조에서 가장 취약한 부분인 코너부(Corner radius)에 대한 굽힘강도 시험과 해석을 수행하였다. 국내에서 AFP를 이용한 제품 제작기술이 보편화되지 않은 초기단계임을 고려하여, 복합재 스파 제작을 위한 맨드릴 설계 및 해석에서 구조 검증시험에 이르기까지의 전 과정을 요약, 정리하였다. 맨드릴 설계에서는 자중과 장비 하중에 의한 처짐, 응력, 열변형, 고유진동수 등을 고려하였다. 대상 시제품은 대형 C-스파이고 AFP로 제작한 후 오토클레이브에서 성형하였다. 제품의 성능 확인을 위해 스파 코너부에서 시편을 채취하여 4점 굽힘시험과 비선형 강도해석을 수행하여 제작된 구조물이 이론적 구조강도에 근접하는 강도를 보이는지 점검하였다. 연구결과, 제안된 공정을 사용하여 제작한 대형 C-스파의 코너부는 최초층 파손이론을 사용한 이론적 강도대비 20% 이내의 차이를 보이는 것을 확인하였고, 향후 양산용 대형 복합재 구조물 제작에 적용될 수 있는 가능성을 확인하였다.

A large composite spar was manufactured using an automatic fiber placement (AFP) machine. To verify its structural performance, the weakest part of the structure, which is called 'corner radius', was tested under bending and examined by finite element analysis. Since the application of AFP machine to composite structure fabrication is still in early stage in Korea, this paper presents the summary of whole process for manufacturing composite spar using AFP machine from mandrel design and analysis to verification test. The deflection and stress by mandrel weight and AFP machine force, thermal deformation and natural frequency were all examined for mandrel design. The target structure was composite C-spar and cured in an autoclave. Test results were compared with nonlinear finite element analysis results to show that the structure has the strength close to the theoretical value. It was confirmed that the corner radius of the spar manufactured by AFP process showed deviation less than 20% compared with first ply failure strength. The results indicate that the AFP technology could be used for large scale composite structure production in the near future.

키워드

참고문헌

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  2. 새로운 개념의 복합재 샌드위치 체결부 구조의 설계와 검증 vol.30, pp.6, 2015, https://doi.org/10.7234/composres.2017.30.6.384
  3. 레이저 초음파 기반 반사식 회전 검사 기법을 이용한 오토클레이브 가공 L 형 복합재 구조물의 모서리 검사 vol.31, pp.5, 2015, https://doi.org/10.7234/composres.2018.31.5.246
  4. 자동 섬유 적층(AFP)을 활용한 열가소성 복합재의 공정 변수에 따른 기계적 물성 평가 vol.32, pp.5, 2015, https://doi.org/10.7234/composres.2019.32.5.229
  5. Corner inspection method for L-shaped composite structures using laser ultrasonic rotational scanning technique vol.30, pp.5, 2015, https://doi.org/10.1080/09243046.2020.1825154