도시철도 차륜의 접촉피로 초기수명 평가

초록

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 (ε-N) and Smith-Watson-Topper method were drawn for the wheel steel as follows: and . The fatigue lifetimes of the wheel due to rolling contact were determined to be infinite by ε-N and SWT methods.

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