Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Estimation of Contact Fatigue Initiation Lifetime of an Urban Railway Wheel

도시철도 차륜의 접촉피로 초기수명 평가

  • Ahn, Jong-Gon (Graduate School of Railroad, Seoul National University of Science and Technology) ;
  • You, In-Dong (Graduate School of Railroad, Seoul National University of Science and Technology) ;
  • Kwon, Seok-Jin (Korean Railroad Research Institute) ;
  • Kim, Ho-Kyung (Dept. of Automotive Engineering, Seoul National University of Science and Technology)
  • 안종곤 (서울과학기술대학교 철도전문대학원) ;
  • 유인동 (서울과학기술대학교 철도전문대학원) ;
  • 권석진 (한국철도기술연구원) ;
  • 김호경 (서울과학기술대학교 자동차공학과)
  • Received : 2012.01.03
  • Accepted : 2012.01.27
  • Published : 2012.02.28
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Abstract

Rolling contact fatigue of an urban railway wheel was analysed during its rolling. A FEM analysis was performed using a 3D modelling of rail and wheel, considering the slope of the rail and nonlinear isotropic and kinematic hardening behavior of the rail and the wheel. The maximum von-Mises stress and contact pressure between the rail and wheel were 656.9 MPa and 1111.4 MPa, respectively, under axial load of 85 kN with friction coefficient of 0. The fatigue initiation life prediction relationships by strain-lifetime (${\varepsilon}$-N) and Smith-Watson-Topper method were drawn for the wheel steel as follows: $N_i=7.35{\times}10^6{\times}SWT^{-3.56}$ and $N_i=5.41{\times}10^{-9}{\times}(\frac{{\Delta}{\varepsilon}}{2})^{-5.77}$. The fatigue lifetimes of the wheel due to rolling contact were determined to be infinite by ${\varepsilon}$-N and SWT methods.

Keywords

References

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