Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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A Study on the Fatigue Life Prediction of Al-2024 with Corrosion

부식을 고려한 항공기재료의 부식피로수명예측 연구

  • 김위대 (부산대학교 항공우주공학과)
  • Published : 2007.01.31
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Abstract

In this study, test results for fatigue crack propagation of Al-2024-T3511 are presented considering corrosion effects, and fatigue lifes are compared for the cases of corrosion and non-corrosion. Higher corrosion environments show lower fatigue life and faster crack growth. To predict the corrosion fatigue life, a corrosion factor concept is newly introduced and applied in Paris' law. The predicted results show good agreement with experimental data and this corrosion fatigue model can be successfully used for the prediction of fatigue life of aluminum structure with corrosion effects.

연구는 Al 2024-T3511 재료를 사용하여 피로균열성장 시험을 통한 비부식과 부식에서의 일정진폭 피로균열 전파 테이터(a-N)를 구하여 비부식과 부식에서의 균열진전의 차이를 규명하였다. 또한 비부식과 부식에서의 균열진전 속도 선도(da/dN-${\Delta}K$)를 구하여 Paris의 식을 이용하여 비부식과 부식의 차이를 규명하였다. 그리고 ${\beta}c$(corrosion factor)의 새로운 개념을 도입하여 피로수명을 예측해 본 결과 실험치를 잘 모사할 수 있었다.

Keywords

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