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Torsional response of stiffened circular composite spar

보강된 복합재 원형 스파의 비틀림 거동

Kim, Sung Joon;Lee, Donggeon
김성준;이동건

  • Received : 2019.03.07
  • Accepted : 2019.03.27
  • Published : 2019.03.31

Abstract

To reduce the structural weight, thin-walled circular composite tube has been used as a main spar of high altitude-long endurance unmanned air vehicle(HALE UAV). Predicting the torsional response of stiffened circular spar is complex due to the inhomogeneous nature of section properties, which are dependent on fiber architecture and constituent material properties. The stiffener were placed in the top and bottom sectors of a tube to increase the torsional capabilities such as the rigidity and buckling strength. Numerical simulations were performed to estimate the effect of the stiffener on the torsional capacities. A static experimental test was performed on a stiffened tube, and the test results were compared with a numerical model. The numerical models showed good correlation and demonstrated the ability to predict the torsional capacity. Results presented herein will exhibit the effectiveness of stiffener on torsional strength and stiffness.

Keywords

HALE UAV;Composite spar;Torsional response;Buckling strength;Torsional test

References

  1. H. Ross, "Fly around the World with a Solar Powered Airplane", The 26th Congress of International Council of the Aeronautical Sciences proceedings, 2008
  2. S. J. Kim, S. Lee, S. C. Kim, T. Kim and S. Kim, "Structural Design and Analysis for High Altitude Long Endurance UAV," Journal of the korean society for aeronautical and space science, Vol. 22, No. 3, 2014, pp. 68-73
  3. S. J. Kim, D. H. Kim, J. Lim, S. W. Lee and T. Kim, "Structural analysis of flexible wing using linear equivalent model" Journal of The Korean Society for Aeronautical and Space Sciences, Vol. 43, No. 8, 2015, pp. 699-705 https://doi.org/10.5139/JKSAS.2015.43.8.699
  4. S. J. Kim, J. W. Shin, H. Kim, T. Kim and S. Kim "The modified Brazier approach to predict the collapse load of a stiffened circular composite spar under bending load", Aerospace Science and Technology, Vol. 55, 2016, pp. 474-481 https://doi.org/10.1016/j.ast.2016.06.018
  5. A. Qureshi and H. Gangna, "Torsional response of closed FRP composite sections", Composites : Part B, Vol. 61, pp. 254-266
  6. R. M. Jones, Mechanics of composite materials, Hemisphere publishing corporation, 1975