Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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An Evaluation of Fatigue Life for Aging Aircraft Structure

장기운용항공기 구조물의 잔여 피로수명예측 기법

  • Lee, Eungyeong (Airframe Analysis Team, Korea Aerospace Industries, LTD.) ;
  • Jeong, Yooin (Airframe Design Team, Korea Aerospace Industries, LTD.) ;
  • Kim, Sangshik (Dept. of Mat. Sci. and Eng., ReCAPT, Gyeongsang National University)
  • 이은경 (한국항공우주산업 기체해석팀) ;
  • 정유인 (한국항공우주산업 기체설계팀) ;
  • 김상식 (경상대학교 금속재료공학과)
  • Received : 2015.07.26
  • Accepted : 2015.08.13
  • Published : 2015.10.27
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Abstract

Aging aircraft structures are inevitably exposed to environment for a long time facing many potential problems, including corrosion and wide spread fatigue damage, which in turn cause the degradation of flight safety. In this study, the environmental surface damages on aging aircraft structures induced during service were quantitatively analyzed. Additionally, S-N fatigue tests were performed with center hole specimens extracted from aging aircraft structures. From the results of quantitative analyses of the surface damages and fatigue tests, it is concluded that corrosion pits initiated during service reduce the fatigue life significantly. Finally, using the fracture mechanics and the EIFS (equivalent initial flaw size) concepts, the remaining fatigue life was predicted based on actual fatigue test results.

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References

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