Fatigue Strength Evaluation of the Aluminum Car body of Urban Transit Unit by Large Scale Dynamic Load Test

도시철도차량 알루미늄 차체의 동적 하중 시험에 의한 피로 강도 평가

  • 서승일 (한국철도기술연구원 고속철도기술개발사업단) ;
  • 박춘수 (한국철도기술연구원 고속철도기술개발사업단) ;
  • 신병천 (한국기계연구원 구조연구부)
  • Published : 2003.11.05

Abstract

Aluminum carbody for rolling stocks is light and perfectly recycled, but includes severe defects which are very dangerous to fatigue strength. Structural integrity assessment for the carbody by static load test has been performed up to date. In this study, to evaluate fatigue strength of the aluminum carbody of urban transit unit. a testing method to simulate dynamic loading condition was proposed and the fatigue strength of the carbody was evaluated. The dynamic load test results showed that the alternating stress ranges were different from the estimated ranges based on the static test results. Excessive stress ranges at the center are thought to come from the flexible motion of the carbody. published fatigue test data for aluminum components, but variation of alternating acceleration along the length due to flexibility of carbody yielded unexpected results. Because fatigue strength based on the static test results may be overestimated at the center, modification of testing method is necessary.

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