高压物理学报2017，Vol.31Issue(6)：785-793,9.DOI:10.11858/gywlxb.2017.06.014
基于Cowper-Symonds本构模型铁路车轮扁疤 激发的轮轨冲击仿真分析
Finite Element Simulation of the Flat-Induced Wheel-Rail Impact Based on the Cowper-Symonds Empirical Model
摘要
Abstract
The wheel-rail interaction is a major concern in research for high-speed rail transport.As a main type of wheel/rail failure,the wheel flats exert serious restriction on the stability and safety of high-speed trains.In this study,a three-dimensional wheel-rail rolling contact model with a flat was built using the Hypermesh software,and the corresponding finite element simulation was conducted, based on the Cowper-Symonds empirical model,using the LS-DYNA 3D explicit algorithm.Influences of the train speed,flat length and axle load on the wheel-rail impact response were discussed, respectively.The simulation results indicate that the maximum vertical wheel-rail impact force is significantly larger than the corresponding static axle load due to the presence of a wheel flat,and the maximum von-Mises equivalent stress and maximum equivalent plastic strain are observed on the wheel-rail contact surface.The strain rate-dependent constitutive parameters of the wheel/rail steels have no influence on the maximum vertical wheel-rail impact force;however,due to the hardening effect of the strain rate,the maximum von-Mises equivalent stress obtained from the Cowper-Symonds model is obviously larger than that derived from the rate-independent one,while the maximum equivalent plastic strain derived from the Cowper-Symonds model is smaller than that under rate-independent one.Besides,the wheel-rail impact response is demonstrated to be sensitive to the train speed,flat length and axle load.These findings can provide technological supports for safety design and assessment of the wheel-rail system.关键词
轮轨冲击/高速铁路/车轮扁疤/Cowper-Symonds模型/有限元仿真Key words
wheel-rail impact/high-speed railway/wheel flat/Cowper-Symonds model/finite element simulation分类
数理科学引用本文复制引用
韩亮亮,敬霖,赵隆茂..基于Cowper-Symonds本构模型铁路车轮扁疤 激发的轮轨冲击仿真分析[J].高压物理学报,2017,31(6):785-793,9.基金项目
国家自然科学基金(51475392,11772275) （51475392,11772275）
西南交通大学引进人才科研启动项目(2682015RC09) （2682015RC09）
牵引动力国家重点实验室自主研究课题(2015TPL_T02) （2015TPL_T02）
