基于不同微观固体接触模型的轮轨表面变形特性分析
首发时间:2016-01-14
摘要:本文利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,研究了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。其中,考虑了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对比,结果表明了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。
关键词: 微观固体接触模型 轮轨接触 粗糙度 Newton-Raphson方法 接触压力 接触半径
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The Analysis of the Wheel/rail Surfaces Deformation Characteristics Based on Different Micro-Contact Models
Abstract:Based on the different statistical micro-contact models including Greenwood-Williamson(GW) model, Chang-Etsion-Bogy(CEB)model and Zhao-Maietta-Chang(ZMC) model, the paper develops a wheel/rail line-contact model under dry condition in order to predict the characteristics of the wheel/rail surfaces deformation of different micro-contact models. And the paper solves the micro-contact models by using the Newton-Raphson method, separation formulas and force balance equation simultaneously and obtains the pressure distribution and the contact width of different micro-contact models under the different roughness. 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).
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