Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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A Study on the Shape Selection of Mechanical Fastening for the Repair of Fighter Wing

전투기 날개 수리를 위한 기계적 체결의 형상 선정에 관한 연구

  • Choi, Dongsu (Department of Aerospace Engineering, Air Force Academy)
  • 최동수 (공군사관학교 항공우주공학과)
  • Received : 2021.04.29
  • Accepted : 2021.08.10
  • Published : 2021.10.05
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Abstract

A study on optimal shape selection of a mechanical fastening for the repair of crack defect of ROK Air Force F-5 fighter wing was conducted. The crack defect occurred in the spar of the wing, and the technical manual does not specify the repair method. However, ROK Air Force decided to develop a repair technology for this defect in consideration of various logistic conditions. Three repair shapes for the proper repair were devised and the finite element analysis was performed to examine the structural safety of these three connection members. As a result of the structural safety review, two connection members except one were structurally safe with safety margins over zero because the calculated stress values were at or below the yield strength level. Therefore, two connection members were determined to be able to use for repair under the condition that the aircraft operated within the design limit load. The results of this study would be very useful if the same defect occurs in long-term aircraft operated by the ROK Air Force.

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References

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