Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Fatigue Strength Evaluation of Bogie Frame of Urban Maglev Train

도시형 자기부상열차 대차 프레임의 피로강도 평가

  • Han, Jeong Woo (Mechanical Systems Safety Research Division, Korea Institute of Machinery & Materials) ;
  • Kim, Heung Sub (Mechanical Systems Safety Research Division, Korea Institute of Machinery & Materials) ;
  • Bang, Je Sung (Mechanical Systems Safety Research Division, Korea Institute of Machinery & Materials) ;
  • Song, See Yeob (Applied Technology Research Team, Hyundai Rotem Company)
  • 한정우 (한국기계연구원 기계시스템안전연구본부) ;
  • 김흥섭 (한국기계연구원 기계시스템안전연구본부) ;
  • 방제성 (한국기계연구원 기계시스템안전연구본부) ;
  • 송시엽 (현대로템(주) 기술연구소 응용기술연구팀)
  • Received : 2012.12.28
  • Accepted : 2013.05.28
  • Published : 2013.07.01
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Abstract

This study evaluated the fatigue strength of the bogie frame of an urban maglev train through fatigue analysis, cumulative damage, and fatigue tests based on a proposed fatigue evaluation method. The results of FEM analysis in which various load combinations were adopted showed that all data were under the fatigue limit of a butt welded joint made of A6005 in a Goodman diagram. The cumulative fatigue damage was calculated at the highest level from a bolt connecting the area of the electromagnetic pole in the casting block; however, the total sum was evaluated as D=0.808 based on $1{\times}10^7$ cycles, which indicates that it did not exceed the failure criteria. In addition, the results of the fatigue testshowed that there was no crack at any position in the bogie frame, which corresponded to the results of fatigue analyses.

본 논문은 도시형 자기부상열차에 사용되는 대차프레임의 피로강도를 평가하는 방법을 제안하였다. 가상의 하중 시나리오로부터 구조해석을 수행하여 응력해석결과를 Goodman 선도상의 피로한계선도와 비교하였으며, UIC 규격에 적용되는 3단계의 피로조건을 적용하여 피로누적손상도(cumulative fatigue damge, D)를 계산하였다. 피로해석결과, Goodman 선도상에서 대차 프레임 사용소재인 A6005 알루미늄 합금 Butt 용접부의 피로한계선도를 초과하지 않았다. 가장 높은 피로손상도는 캐스팅 블록 및 전자석 폴 연결부로서 $1{\times}10^7$ cycles 기준으로 D=0.808로 계산되어 파손기준을 초과하지 않음을 확인하였다. 피로해석과 동일 조건으로 실시된 수직, 좌우, 전후 방향의 피로시험에서 대차 프레임의 어느 위치에서도 균열이 발생되지 않았으며, 이는 피로안전측으로 계산된 해석결과와 부합되는 결과이다.

Keywords

References

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