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Elastic-Plastic Analysis on the Contact of Wagon Wheels and Heavy Haul Frogs

机译：马车车轮与重型运输青蛙接触的弹塑性分析

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The phenomenon of spallings on the frog used in the heavy haul railway occurs easily, which reduced the service life of frog. The worn profiles of No. 12 unmovable frog with 75 kg/m rail and wagon wheels used in Datong-Qinhuangdao have been measured. They are used to established an elastic-plastic finite element model to study the contact problem of wheel and frog at different location. The contact patches, the equivalent Von Mises stress and the variation of contact path have been analyzed. The results indicate that the contact patch on the nose rail is near the center line of top surface when the wheel contact with the standard frog and it is on the edge of nose rail when the wheel contact with the worn frog. The equivalent Von Mises stress exceeds the yield limit into the plastic deformation stage. When the wagon passes the standard frog, the wheel contacts with the wing rail, then transits to the nose rail gradually. However, when the wheel runs over the worn frog, the contact point shifts from wing rail to nose rail and then moves to the wing rail again. The contact status of wheel and frog changes between one point contact and two point contact, which causes the variation of equivalent Von Mises stress of the wing and nose rail. Besides, the wheel displacement has a great effect on the equivalent Von Mises stress and therefore it should be taken into consideration when designing the match of wheel and frog. The research provides a theoretical basis for the design of wheel and frog profiles used in the heavy haul railway.
机译：在重载铁路上使用的青蛙容易发生剥落现象，从而缩短了青蛙的使用寿命。测量了大秦铁路使用的75 kg / m钢轨和货车车轮的12号不可移动青蛙的磨损轮廓。它们被用来建立弹塑性有限元模型，以研究车轮和青蛙在不同位置的接触问题。分析了接触贴片，等效的冯·米塞斯应力和接触路径的变化。结果表明，当车轮与标准蛙类接触时，前鼻梁上的接触斑块位于顶面的中心线附近，而当车轮与磨损的蛙类接触时，前鼻片上的接触斑块位于鼻梁的边缘上。等效的冯·米塞斯应力超过塑性变形阶段的屈服极限。当货车经过标准青蛙时，车轮与翼轨接触，然后逐渐过渡到前轨。但是，当车轮越过磨损的青蛙时，接触点会从翼轨移至鼻梁，然后再次移至翼轨。轮与青蛙的接触状态在一点接触和两点接触之间发生变化，这导致机翼和前鼻梁的等效冯·米塞斯应力发生变化。此外，车轮位移对等效冯·米塞斯应力有很大的影响，因此在设计车轮与青蛙的匹配时应考虑到这一点。该研究为重型运输铁路轮辋和蛙型的设计提供了理论依据。

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