Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Compression and Bending Test for the Stiffness of Composite Lattice Subelement

복합재 격자 구조의 강성 평가를 위한 Subelement의 압축, 굽힘 시험

  • Jeon, Min-Hyeok (Department of Aerospace Engineering, Chungnam National University) ;
  • Kang, Min-Song (Department of Aerospace Engineering, Chungnam National University) ;
  • Kim, In-Gul (Department of Aerospace Engineering, Chungnam National University) ;
  • Kim, Mun-Guk (Department of Aerospace Engineering, Chungnam National University) ;
  • Go, Eun-Su (Department of Aerospace Engineering, Chungnam National University) ;
  • Lee, Sang-Woo (Defense and Aerospace Division, Hankuk Fiber Group)
  • Received : 2017.07.24
  • Accepted : 2017.12.20
  • Published : 2017.12.31
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Abstract

The composite lattice structures have advantages of high specific stiffness and strength and are mainly applied to the structures of launch vehicles that carry the compressive load. However, since these structures are manufactured by filament winding technology, there are some defects and voids found in the knots. For these reasons, the stiffness and strength of the lattice structures have to be compared with finite element model for predicting design load. But, the full scale test is difficult because time and space are limited and the shape of structure is complex, and hence the simple and reliable test methods for examination of stiffness are needed. In this paper, subelements of composite lattice structures were prepared and compressive and bending test were conducted for examination of stiffness of helical and hoop rib. Test methods for subelements of composite lattice structures that has curved and twisted shape were supposed and compared with finite element analysis results.

복합재 격자 구조물은 무게가 가볍고 비강성, 비강도가 높다는 장점이 있으며 주로 압축 하중이 작용하는 발사체구조에 적용된다. 그러나 필라멘트 와인딩 기법으로 제작되므로 섬유가 겹쳐지는 부분에서 기공과 결함이 발생하게 된다. 설계 하중 도출을 위한 해석 모델 검증을 위해 구조물의 강성, 강도 확인이 필요하지만 Full scale 시험의 경우 시간, 공간상의 제약이 따르며 구조물의 형상이 복잡하므로 시험에 어려움이 많다. 따라서 강성 확인을 위한 Subelement 단위의 시험법이 필요하다. 본 논문에서는 복합재 격자 구조물을 단위격자구조로 가공하였으며 각각 압축, 굽힘 시험을 수행하여 나선 리브, 원주 리브의 강성을 확인하였다. 휘임, 비틀림 형상을 가진 원통형 복합재 격자 구조물의 강성 평가를 위한 압축, 굽힘 시험법을 제안하였으며 유한요소해석을 수행하여 시험결과와 비교하였다.

Keywords

References

  1. Vasiliev, V.V., Barynin, V.A., and Razin, A.F., "Anisogrid Composite Lattice Structures-Development and Aerospace Applications," Composite Structures, Vol. 94, No. 3, 2012, pp. 1117-1127. https://doi.org/10.1016/j.compstruct.2011.10.023
  2. Terashima, K., Kmita, T., Kimura, G., Uzawa, T., Aoki, T., and Yokozeki, T., "Experimental and Analytical Study of Composite Lattice Structure for Future Japanese Launchers," Proceeding of the 19th International Conference on Composite Materials, Montreal, Canada, Aug. 2013, pp. 5373-5382.
  3. Aoki, T., Yamazaki, H., Yokozeki, T., Terashima, K., and Kmita, T., "Design Constraints of Composite Lattice Cylinders for Aerospace Applications," Proceeding of the 19th International Conference on Composite Materials, Montreal, Canada, Aug. 2013.
  4. Buragohain, R., and Velmurugan, R., "Study of Filament Wound Grid-Stiffened Composite Cylindrical Structures," Journal of Composite Materials, Vol. 92, No. 2, 2011, pp. 1031-1038.
  5. Totaro, G., De Nicola, F., Grilli, A., Ferrigfo, A., and Caramuta, P., "Micromechanics of Composite Anisogrid Structures," Proceeding of the 16th European Conference on Composite Materials, Seville, Spain, Jun. 2014.
  6. ASTM D6641, Standard Test Method for Determining the Compressive Properties of Polymer Matrix Composite Laminates Using a Combined Loading Compression (CLC) Test Fixture.
  7. ASTM D7264, Standard Test Method for Flexural Properties of Polymer Matrix Composite Materials.
  8. Kang, M.S., Jeon, M.H., Kim, I.G., Go, E.S., Kim, M.G., and Lee, S.W., "The Buckling Behavior for the Helical Rib of Composite Lattice Structure due to the Resin Rich Layer," Proceeding of the Korean Society for Aeronautical & Space Sciences 2017 Fall Conference, Jeju, Korea, Nov. 2017, pp. 81-82.

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