Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Fatigue Cumulative Damage and Life Prediction of Uncovered Freight Car Under Service Load using Rainflow Counting Method

운전하중하의 레인플로집계법을 이용한 철도차량 무개화차의 피로누적손상과 수명예측

  • Baek, Seok-Heum (Department of Mechanical Engineering, Graduate School, Dong-A University) ;
  • Lee, Kyoung-Young (Department of Mechanical Engineering, Graduate School, Dong-A University) ;
  • Mun, Sung-Jun (Department of Vehicle Engineering, Samcheok National University) ;
  • Cho, Seok-Swoo (Department of Vehicle Engineering, Samcheok National University) ;
  • Joo, Won-Sik (Department of Mechanical Engineering, Dong-A University)
  • 백석흠 (동아대학교 기계공학과 대학원) ;
  • 이경영 (동아대학교 기계공학과 대학원) ;
  • 문성준 (삼척대학교 자동차공학과) ;
  • 조석수 (삼척대학교 자동차공학과) ;
  • 주원식 (동아대학교 기계공학과)
  • Published : 2005.03.01
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Abstract

An end beam is one of the most important structural members supporting uncovered freight under in-service loading. In general, it needs to endure over 25 years. However fatigue fracture has occurred at dynamic stress concentration location of the end beam because user's specifications demanded high speed and vehicle manufacturer made the uncovered freight car with comparatively low strength and stiffness. For durability analysis, finite element analysis is performed to evaluate the problem of uncovered freight structure and local strain. The uncovered freight car was operated on actual problematic railroad line to measure dynamic stress versus time history on the critical part from which a crack is initiated often. Rainflow cycle counting method was used to estimate fatigue damage at dangerous area under operating condition. Therefore, this study shows that analytical fatigue life at the end beam can be predicted on the basis of S-N curve and structure analysis and has a fairly good correlation with experimental fatigue life.

Keywords

References

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