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首页> 外文期刊>Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear >Assessment of methods for calculating contact pressure in wheel-rail/switch contact
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Assessment of methods for calculating contact pressure in wheel-rail/switch contact

机译：评估轮轨/开关接触中接触压力的计算方法

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Two models for wheel-rail rolling contact that are based on the half-space assumption are compared in this paper: Hertz and the non-Hertzian method implemented in the computer program CONTACT. These two models are further restricted by the assumption of linear-elastic material behaviour. Moreover, one elastic and one elastic-plastic finite element model of the contact are investigated with the commercial code ABAQJJS. The finite element method is not limited by the half-space assumption or applicable to a linear-elastic material model only. The objective is to assess the four methods based on calculated contact pressure, contact patch size and penetration depth. Contact loads and contact locations, used as input data in the analysis, are taken from a vehicle dynamics simulation in the software GENSYS. The comparison is performed at a given cross-section in the crossing panel of a selected turnout design. To fulfil the requirements of the half-space assumption, the dimensions of the contact area must be small compared to the radii of curvature of the bodies in contact. On the selected cross-section, however, the half-space assumption does not hold since the smallest radius of rail curvature at the contact point is 13 mm, which is comparable to the largest semi-axis of the contact area. Nevertheless, it is found that the contact pressure distributions calculated using Hertz and CONTACT correlate well with those results obtained from the finite element method as long as no plastification of the material occurs.
机译：本文比较了基于半空间假设的两种轮轨滚动接触模型：Hertz和在计算机程序CONTACT中实现的非Hertzian方法。线性弹性材料行为的假设进一步限制了这两个模型。此外，用商业代码ABAQJJS研究了一种弹性接触模型和一种弹性塑性接触模型。有限元方法不受半空间假设的限制，或仅适用于线弹性材料模型。目的是基于计算出的接触压力，接触斑块尺寸和穿透深度来评估这四种方法。在分析中用作输入数据的接触载荷和接触位置取自GENSYS软件中的车辆动力学仿真。比较是在选定道岔设计的交叉面板中的给定横截面处进行的。为了满足半空间假设的要求，接触区域的尺寸必须比接触物体的曲率半径小。但是，在选定的横截面上，半空间假设不成立，因为在接触点处的最小轨道曲率半径为13 mm，这与接触区域的最大半轴相当。然而，发现只要不发生材料的增塑，使用Hertz和CONTACT计算的接触压力分布与从有限元方法获得的结果具有良好的相关性。

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