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

The Korean Society of Mechanical Engineers (대한기계학회)
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S-N Curve Deduction of a KTX High-Speed Train Structure for an Accelerated Life Testing

가속수명시험을 위한 KTX고속열차 구조물의 S-N 선도 추정

  • 정달우 (한양대학교 대학원 기계공학과) ;
  • 최낙삼 (한양대학교 기계정보경영학부) ;
  • 박수한 ((주) 알에스피)
  • Published : 2009.04.01

Abstract

An accelerated fatigue test is essentially required to maintain the reliability of the actual structures of KTX under operation conditions. However, actual fatigue life cannot be obtained because the conventional fatigue tests are not adequate to the real load conditions. Moreover foreign component makers have not provided data of the loading stresses (S) versus cycles at the failure (N). In this study, we suggested a deduction method of the S-N curve for establishing an accelerating test under various load levels. Load history was acquired from the field tests. A Rainflow method was used on the cycle counting of the field load data. After that, an S-N curve was obtained through the iteration process under the condition that the damage index satisfies to 1 in the Miner's rule. The deduced S-N curve was applied to the performance evaluation of Korean-made sealed knuckles compared with imports.

Keywords

Rainflow Counting;Accelerated Life Testing;Miner's Rule;S-N Curve Deduction;Equivalent Stress

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