한국추진공학회지 (Journal of the Korean Society of Propulsion Engineers)

  • 제18권2호
  • /
  • Pages.73-79
  • /
  • 2014
  • /
  • 1226-6027(pISSN)
  • /
  • 2288-4548(eISSN)
한국추진공학회 (The Korean Society of Propulsion Engineers)
권호 표지
DOI QR코드

DOI QR Code

에그-박스 코어 형상 변화에 따른 등가 전단 탄성계수 수치 해석 연구

Analytical Study on Equivalent Shear Modulus according to Shape of Egg-box Core

  • Lee, SangYoun (Advanced Propulsion Technology Center, Agency for Defence Development) ;
  • Yun, Su-Jin (Advanced Propulsion Technology Center, Agency for Defence Development) ;
  • Park, DongChang (Advanced Propulsion Technology Center, Agency for Defence Development) ;
  • Hwang, Kiyoung (Advanced Propulsion Technology Center, Agency for Defence Development)
  • 투고 : 2012.11.30
  • 심사 : 2014.03.06
  • 발행 : 2014.04.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

본 논문에서 다루고 있는 에그-박스 코어는 공기 흡입식 추진기관의 연소실 케이스로 사용되고 있다. 무게의 경량화 및 제작 비용/시간을 절감하기 위한 목적으로 에그-박스 코어의 피치 길이 및 두께 변경의 필요성이 대두되었다. 짧은 시간 내에 에그-박스 코어 변경에 있어 연소실 케이스의 구조 안정성에 영향을 미치는 등가 전단 탄성계수의 특성을 파악할 수 있는 방법으로 굽힘 시험을 모사한 유한요소해석을 이용하였다. 등방성 재료인 H130-폼 코어를 가지는 샌드위치 판넬에 대한 유한요소해석을 수행하여 얻은 전단 탄성계수 값이 참고문헌에서 주어진 값과 거의 일치함을 확인하였다. 에그-박스 코어의 피치 길이와 두께 변화에 따른 등가 전단 탄성계수 변화를 확인할 수 있었다.

The sandwich shell with Egg-box core has been used for the combustion chamber case of air breathing propulsion system. The alteration on pitch length and thickness of Egg-box core was required to be lighter and save manufacturing time and cost of combustion chamber case. In this paper, the finite element analysis method which simulated bending test was used to predict the equivalent shear modulus which affect structural stability of sandwich shell in short time. The result of FE calculation on sandwich panel with homogeneous material, H130-foam core, showed a good agreement with the values available in the reference. The equivalent shear modulus of Egg-box core according to the variation of pitch length and thickness can be obtained.

키워드

참고문헌

  1. Akisanya, A.R. and Fleck, N.A., "Plastic Collapse of Thin-Walled Frusta and Egg-Box Material under Shear and Normal Loading," International Journal of Mechanical Sciences, Vol. 48, pp. 799-808, 2006. https://doi.org/10.1016/j.ijmecsci.2006.01.020
  2. Libove, C. and Hubka, R.E., "Elastic Constants for Corrugated-Core Sandwich Plates," NACA TN 2289, 1951.
  3. Ko, W.L., "Elastic Constants for Superplastically Formed/Diffusion-Bonded Sandwich Structures," AIAA Journal, Vol. 18, No. 8, pp. 986-987, 1980. https://doi.org/10.2514/3.50842
  4. Ueng, C.E.S., Underwood, E.E. and Liu, T.L., "Shear modulus of superplastically formed sandwich cores," Computers & Structures, Vol. 10, No. 2, pp. 393-397, 1979. https://doi.org/10.1016/0045-7949(79)90110-X
  5. Ueng, C.E.S. and Kim, T.D., "Shear modulus of Core Materials with Arbitrary Polygonal Shape," Computers & Structures, Vol. 16, No. 1, pp. 21-25, 1983. https://doi.org/10.1016/0045-7949(83)90143-8
  6. Merghni, F., Desrumaux, F. and Benzeggagh, M.L., "Mechanical Behaviour of Cellular Core for Structural Sandwich Panels," Composite Part A, Vol. 30, No. 6, pp. 767-779, 1999. https://doi.org/10.1016/S1359-835X(98)00182-1
  7. Kim, S.W., Lee, Y.S. and Kang, B.S., "Analytical and Numerical Study on Mechanical Behavior of Unit Cell of Pyramidal Truss," Journal of the Korean Society for Precision Engineering, Vol. 28, No. 5, pp. 623-631, 2011.
  8. Ahn, D.G., Nam, G.H., Jung, C.G. and Yang, D.Y., "Elastic Properties of Thin Sandwich Plate with Woven Metal," The KSPE Spring Conference, pp. 167-168, 2009.
  9. Jeon, J.H. and Hwang, W.B., "FEM Analysis of Smart Skin Structure Specimen," Journal of the Korean Society for Composite Materials, Vol. 16, No. 4, pp. 59-65, 2003.
  10. Lee, S.Y., Yun, S.J., Park, D.C. and Yoon, H.G., "Prediction of Equivalent Shear Modulus of Sandwich Panel," The Korean Society for Propulsion Engineers Spring Conference, 2011.
  11. Lee, S.Y., Yun, S.J., Park, D.C. and Yoon, H.G., "Equivalent Shear Modulus of Egg-Box Core," The Korean Society for Propulsion Engineers Fall Conference, 2011.
  12. Tom Bitzer, Honeycomb Technology, 1st Ed., Champman & Hall, 1997.
  13. Toftegaard, H., "Initial Fixture Design for Direct Shear Testing of Sandwich Core Materials," Proceddings of the 27th Riso International Symposium on Materials Science, pp. 337-347, 2006.