Analysis Of Wheel/Rail Contact Stress And Influent Factors In The Alloy Steel Combined Frog

Trans-interval Jointless Line is the track structure that is suited to High-Speed and Heavy Haul Railway and the necessary key technical in the Speed Increase and Heavy Haul Switch. At present, the main Speed Increase Switchs of our country are the High Manganese Steel Integral Casting frogs and the rail Assembling Combined steel frogs. The High Manganese Steel Integral Casting frog is the frog that has low integral strength,high Discrete scale service life and poor weldability. However, the rail Assembling Combined steel frog has poor mechanical properties and the nose rail appears the phenomenon of the flaking and spalling in early time. Then the frog is destroyed. It can be seen that the two frogs can't meet the demand of the Speed Increase frog and we must find another kind of frog to substitute the two frogs.With appearance of the alloy steel combined frog that has large carrying capacity and high strength, the former two frogs are substituted by it. But wing rails use PD3 steel and nose rails use the austenite steel.The strength of nose rails is larger than that of wing rails. The wing rails destroyed are more than nose rails when wheels pass here. So we must calculate stress influent field and the magnitude of contact stress.Considering the real geometry and boundary conditions, the paper makes use of the Finite Element Method to establish wheel/rail contact calculation model under the condition of the eslasic basement constraints in the frog section.lt makes some detailed analysis from the throat to the 20-50mm width nose rail. By changing the Variable of the Friction Coefficient,the Axle Load,the basement Vertical and Lateral Rigidity,the nose rail's reduction value and radius, we do some careful contact analysis to nose rails and wing rails. The result can provide data for the reasonable turnout design.The research suggests that the biggest influent factors are the axle load,the nose rail's reduction value and radius among all the factors, then are the Friction Coefficient and Vertical Rigidity. The influence of the Lateral Rigidity is not obvious. The stress of wing rails is the biggest between throat and 30mm of the nose rail. The wing rail will be easily destroyed after a long time that will be not benefit to the operation. Therefore, we must consider strengthening wing rails in the design.