Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Study on the Bearing Strength of Bolt Jointed Section for Composite Aircraft Radome Under Hygrothermal Environments

열습환경을 고려한 항공기용 레이돔 볼트 체결부의 베어링 강도에 관한 연구

  • Received : 2017.01.17
  • Accepted : 2017.05.26
  • Published : 2017.08.01
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Abstract

This research investigated the hygrothermal effect on the strength of bolt jointed section and moisture contents of composites exposed to hygrothermal environment for composite aircraft radome. The decrease in strength in the test environment is mainly attributed to the change in the material properties of the matrix due to temperature and moisture. The composite specimens were tested in three different environmental conditions: RTD(room temperature and dry), CTD(cold temperature and dry) and ETW(elevated temperature and wet). The failure mode of the bolt jointed composite specimens were studied using tests and finite element analysis. Finite element analysis reasonably predicted the failure load and mode of the joints. A reliability-based design was carried out for the bolt jointed composites of radome.

본 연구에서는 항공기용 레이돔에 적용되는 복합재의 볼트 체결부 강도에 대한 온도 및 습도 환경의 영향을 연구하였으며 열습환경에 노출된 레이돔 체결부에 대해 수분흡수율을 구하고, 온도와 습도환경에 따른 체결부 강도의 물성변화를 확인하였다. 이때 시편은 환경조건을 고려하여 상온건조(RTD), 고온고습(EWT), 저온건조(CTD) 세 가지로 구분하였으며 볼트 체결부의 파손하중 및 파손모드를 결정하기 위한 실험과 유한요소해석을 수행하였다. 유한요소해석의 결과가 체결부 강도와 파손모드에서 실험결과와 잘 일치하였으며 체결부 파손강도 예측이 가능한 효과적인 방법으로 확인하였다.

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References

  1. The American Society for Testing and Materials 2013, "ASTM D5961 Standard Test Method for Bearing Response of Polymer Matrix Composite Laminates."
  2. Bradley, W. L. and Grand, T. S., 1995, "The Effect of the Moisture Absorption on the Interfacial Strength of Polymeric Matrix Composites," Journal of Materials Science, Vol. 30, No. 21, pp. 5537-5542. https://doi.org/10.1007/BF00351570
  3. Gautiera, L., Mortaignea, B. and Bellenger, V., 1999, "Interface Damage Study of Hydrothermally Aged Glass-Fibre-Reinforced Polyester Composite," Com-posites Science and Technology, Vol. 59, No. 16, pp. 2329-2337. https://doi.org/10.1016/S0266-3538(99)00085-8
  4. The American Society for Testing and Materials 2012, "ASTM D5229 Standard Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials."
  5. Xiao, G. Z. and Shanahan, M. E. R., 1998, "Swelling of DGEBA/DDA Epoxy Resin during Hygrothermal Aging," Polymer, Vol. 14, No. 14, pp. 3253-3260.
  6. Rege, S. K. and Lakkad, S. C., 1983, "Effect of Salt Water on Mechanical Properties of Fibre Reinforced Plastics," Fibre Science and Technology, Vol. 19, No. 4, pp. 314-324.
  7. Smith, C. S., 1990, "Design of Marine Structures in Composite Materials," Elsevier Applied Science, London.
  8. Gellert, E. P. and Turley, D. M., 1999, "Seawater Immersion Ageing of Glass-Fibre Applications," Composites, Part A, Vol. 30, No. 11, pp. 1259-1265. https://doi.org/10.1016/S1359-835X(99)00037-8
  9. Chang, F. K., Scott, R. A. and Springer, G. S., 1982, "Strength of Mechanically Fastened Composite Joints," Journal of Composite Materials, Vol. 16, pp. 470-494. https://doi.org/10.1177/002199838201600603
  10. Department of Defense., 2002, "MIL-HDBK-17-1F Volume 1. Polymer Matrix Composites Guidelines for Characterization of Structural Materials."
  11. Hart-smith, L. J., 1987, "Design and Empirical Analysis of Bolted or Rivetes Joints," in Joining Fibre-Rainforced Plastics edited by F. L. Mathews, Elsevier Applied Science, London.
  12. Jones, R. M., 1975, "Mechanics of Composite Materials," McGraw-Hill, New York, USA