Design and Application of Rail Anti-fatigue Profile for Heavy Haul Railway
In order to improve the wheel rail contact relationship,based on the cubic interpolation spline curve method,a small radius curve rail anti fatigue profile for heavy haul railway was designed by reducing the rail shoulder-gauge edge profile.Combining with the vehicle track dynamics model under heavy haul transportation conditions,the benchmark profile for grinding and milling of heavy haul railway rails was determined and applied on site according to parameters such as contact point position,wheel-rail contact area,lateral force,derailment coefficient,wheel load reduction rate,and wear index.The reference profile is that the reduction starting point of the rail shoulder-gauge edge profile is moved by 5 mm from the center of the rail top towards the near gauge edge direction,and the range of profile change covers the starting point to the side wear point on the gauge edge.The maximum reduction of the profile arc surface within the change range occurs at 26 mm from the center of the rail top towards the gauge edge,and the maximum reduction of the arc surface is 0.6、0.7 mm.The on-site test results show that the benchmark surface reduces the vertical and lateral forces between the wheel and rail,improves the wheel-rail contact relationship,and stabilizes the contact point position.The predicted crack initiation life has been extended by 16.3%～47.2%,which could meet the needs of improving vehicle operating conditions and extending the service life of heavy haul railway rails.
heavy haul railwaywheel-rail relationmodel simulationfield testanti-fatigue profile of steel railrolling contact fatiguerail grinding
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