基于不同微观固体接触模型的轮轨表面变形特性分析

针对轮轨表面接触变形问题，采用不同的统计型微观固体接触模型，即Greenwood-Williamson （GW）模型，Chang-Etsion-Bogy （CEB）模型和Zhao-Maietta-Chang （ZMC）模型，研究轮轨接触表面变形特性。利用Newton-Raphson方法对微观固体接触模型公式进行求解，并同时求解间隙方程和载荷平衡方程。考虑不同粗糙度和不同塑性指数下各微观固体接触模型的压力分布情况，以及接触半径随载荷的变化情况。并将不同微观固体接触模型的结果和Hertz模型结果对比，结果表明弹塑性微观接触模型（CEB，ZMC）比弹性模型（GW）有着更小的接触压力以及更宽的接触半径，最大压力均小于最大Hertz接触压力，接触半径均大于Hertz接触半径。

Analysis of the Wheel/rail Surfaces Deformation Characteristics Based on Different Micro-contact Models

In view of the wheel/rail contact surfaces deformation, based on the different statistical micro-contact models including Greenwood-Williamson(GW) model, Chang-Etsion-Bogy (CEB) model and Zhao-Maietta-Chang (ZMC) model, a wheel/rail line-contact model under dry condition is used to predict the characteristics of the wheel/rail surfaces deformation of different micro-contact models. And the formulas of micro-contact models are solved by using the Newton-Raphson method, separation formulas and force balance equation simultaneously, which obtains the pressure distribution and the contact width of different micro-contact models under the different roughness and plasticity index. Comparison of the different contact models shows that the use of elastic-plastic micro-contact models (CEB, ZMC) predict a lower maximum normal pressure and a greater contact width to the elastic model (GW). The max contact pressure of the three models is smaller than max Hertz contact pressure and the contact width is a wider range.