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Research Article

Remaining Fatigue Life Estimation under Various Loading Conditions using Walker Equation

다양한 하중 조건에서 Walker Equation을 이용한 잔여 수명 추정

Ohjun Kwon1
,
Hoon Sohn2
,
Hyung Jin Lim3*
권 오준1
,
손 훈2
,
임 형진3*
1Post-Doctoral Researcher, Nondestructive Metrology Group, Korea Research Institute of Standards and Science, Daejeon 34113, Korea
2Professor, Department of Civil and Environmental Engineering, KAIST, Daejeon 34141, Korea
3Professor, Department of Civil and Energy System Engineering, Kyonggi University, Suwon 16227, Korea
1한국표준과학연구원 비파괴측정그룹 박사후연구원
2한국과학기술원 건설및환경공학과 교수
3경기대학교 사회에너지시스템공학과 교수
*Corresponding Author
31 December 2024. pp. 82-93
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Abstract

In this study, the remaining fatigue life estimation technique under various uniaxial loading conditions is developed using the Walker equation. First, the Walker equation parameters are estimated from multiple specimen tests by applying constant-amplitude cyclic uniaxial loading with different stress levels. Next, the stress applied to the target structure under various uniaxial loading conditions is converted into the equivalent uniform cyclic stress with a constant stress range and mean stress. Then, the fatigue crack length and fatigue life of the target structure are estimated based on the Walker equation. Finally, the remaining fatigue life is estimated using the converted equivalent uniform cyclic stress and estimated fatigue life. The performance of the developed technique is experimentally validated using notched aluminum plate specimens under various uniaxial loading conditions.

Keywords
remaining fatigue life
walker equation
equivalent uniform cyclic stress
fatigue life

본 연구에서는 Walker equation을 이용하여 다양한 하중 조건에 적용 가능한 잔여 수명 추정 기술을 개발하였다. 먼저 24개의 알루미늄 평판 시편을 이용해 피로 실험을 수행하여 하중 사이클에 따른 피로 균열 길이를 측정하였고, 측정된 피로 균열 길이 데이터로부터 시편의 Walker equation parameters를 추정하였다. 다음으로 추정된 Walker equation parameters를 이용하여 시편에 가해진 다양한 ∆σ와 σmean을 가지는 하중을 하나의 ∆σ와 σmean을 가지는 등가 하중으로 변환하였다. 그리고 Walker equation 기반으로 추가 등가 하중에 따른 피로 균열 길이와 시편의 피로 수명을 추정하였다. 마지막으로 변환된 등가 하중과 계산된 피로 수명을 이용해서 시편의 잔여 수명을 추정하였다. 개발된 잔여 수명 추정 기술의 성능은 노치가 있는 알루미늄 평판 시편을 이용해 다양한 하중 조건에서 성공적으로 검증되었다.

키워드
잔여 수명 추정
Walker equation
등가 하중 변환
피로 수명
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Information
  • Publisher :Korean Institute of Bridge and Structural Engineers
  • Publisher(Ko) :한국교량및구조공학회
  • Journal Title :Journal of Structure Research and Practice
  • Journal Title(Ko) :한국교량및구조공학회 논문집
  • Volume : 2
  • No :2
  • Pages :82-93
  • Received Date : 2024-11-08
  • Revised Date : 2024-12-13
  • Accepted Date : 2024-12-13
  • DOI :https://doi.org/10.22725/JSRP.2024.2.2.82
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