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

  • 제39권12호
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  • Pages.1107-1114
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  • 2011
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  • 1225-1348(pISSN)
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  • 2287-6871(eISSN)
한국항공우주학회 (The Korean Society for Aeronautical and Space Sciences)
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모델 불확실성을 고려한 레이저 피닝 구조물의 피로 수명 예측

Fatigue Life Prediction of a Laser Peened Structure Considering Model Uncertainty

  • 임종빈 (한국항공우주연구원) ;
  • 박정선 (한국항공대학교 항공우주 및 기계공학부)
  • 투고 : 2011.09.28
  • 심사 : 2011.11.22
  • 발행 : 2011.12.01
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⟨ 이전 논문 다음 논문 ⟩

초록

본 논문에서는 레이저 피닝(Laser peening) 구조물에 대한 피로 수명을 예측하였다. 레이저 피닝에 의해 생성된 압축잔류응력(Compressive residual stress)을 계산하기 위해서 유한 요소 시뮬레이션(Finite element simulation)을 수행하였고, 피로 수명 예측 시에 압축잔류응력 효과를 고려하기 위해서 수정된 Goodman 식을 사용하였다. 또한, S-N 선도 모델 불확실성(Model uncertainty)을 고려한 피로 수명 예측을 위해 부가 적응 인자 접근법(Additive adjustment factor approach)을 적용하여 예측된 피로 수명의 신뢰 구간(Reliable bounds)을 결정하였다.

In this paper, the fatigue life of a laser peened structure was predicted. In order to calculate residual stress induced by laser peening finite element simulation was carried out. Modified Goodman equation was used to consider the effect of compressive residual stress induced by laser peening in fatigue analysis. In addition, additive adjustment factor approach was applied to consider S-N curve model uncertainty. Consequently, the reliable bounds of the predicted fatigue life of the laser peened structure was determined.

키워드

참고문헌

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