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钢轨波磨区段科隆蛋扣件弹条断裂机理

崔晓璐 彭双千 徐佳 钟建科 祁亚运

崔晓璐, 彭双千, 徐佳, 钟建科, 祁亚运. 钢轨波磨区段科隆蛋扣件弹条断裂机理[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20230025
引用本文: 崔晓璐, 彭双千, 徐佳, 钟建科, 祁亚运. 钢轨波磨区段科隆蛋扣件弹条断裂机理[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20230025
CUI Xiaolu, PENG Shuangqian, XU Jia, ZHONG Jianke, QI Yayun. Fracture Mechanism of Cologne-Egg Fastener Clips in Rail Corrugation Sections[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230025
Citation: CUI Xiaolu, PENG Shuangqian, XU Jia, ZHONG Jianke, QI Yayun. Fracture Mechanism of Cologne-Egg Fastener Clips in Rail Corrugation Sections[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230025

钢轨波磨区段科隆蛋扣件弹条断裂机理

doi: 10.3969/j.issn.0258-2724.20230025
基金项目: 国家自然科学基金项目(51975078);重庆市自然科学基金项目(CSTB2022NSCQ-MSX1542);重庆市教育委员会科学技术研究项目(KJZD-K202100703)
详细信息
    作者简介:

    崔晓璐(1990—),女,教授,博士,研究方向为轮轨摩擦学,E-mail:cui_xiaolu@foxmail.com

  • 中图分类号: U211

Fracture Mechanism of Cologne-Egg Fastener Clips in Rail Corrugation Sections

  • 摘要:

    钢轨波磨作为地铁线路的典型钢轨损伤形式,其高发区段常伴随着扣件弹条断裂问题,严重影响列车的运营安全. 其中,科隆蛋扣件小半径区段是钢轨波磨的高发区段. 为探究科隆蛋扣件弹条的断裂机理,首先结合现场调研,构建包含完整科隆蛋扣件的轮对-钢轨-扣件系统有限元模型;然后,从共振响应的角度探究轮轨摩擦耦合振动激励下科隆蛋扣件弹条的共振响应;最后,从疲劳寿命角度,对比有无波磨区段科隆蛋扣件弹条的疲劳寿命情况,并以此量化不同弹条的疲劳损伤情况. 研究结果表明:在钢轨波磨高发区段,轮轨摩擦耦合振动主频与科隆蛋扣件弹条一阶约束模态一致,轮轨摩擦耦合振动引起的弹条共振是科隆蛋扣件断裂的主要原因;钢轨波磨加剧了轮轨摩擦耦合振动,使得科隆蛋扣件弹条寿命相较无波磨区段下降99.04%,仅为设计寿命的3.11%;此外,科隆蛋扣件小半径曲线区段低轨工作边一侧的弹条更容易发生疲劳失效,失效位置位于其弹条后拱端内侧.

     

  • 图 1  科隆蛋扣件区段钢轨波磨及扣件断裂特征

    Figure 1.  Rail corrugation and fastener fracture characteristics of Cologne-egg fastener section

    图 2  轮对-钢轨-扣件系统的有限元模型

    Figure 2.  Finite element model of wheel set-rail-fastener system

    图 3  科隆蛋扣件弹条扣压过程模拟

    Figure 3.  Simulation of Cologne-egg fastener clip compression process

    图 4  科隆蛋扣件弹条安装状态

    Figure 4.  Installation status of Cologne-egg fastener clip

    图 5  轮对-钢轨-扣件系统的瞬时动态分析结果

    Figure 5.  Instantaneous dynamic analysis results of wheel set-rail-fastener system

    图 6  科隆蛋扣件弹条10~2000 Hz约束模态频率及振型

    Figure 6.  Constraint modal frequency and vibration mode of Cologne-egg fastener clip at 10–2000 Hz

    图 7  科隆蛋扣件弹条节点加速度

    Figure 7.  Node acceleration of Cologne-egg fastener clip

    图 8  科隆蛋扣件弹条最大应力时程图

    Figure 8.  Maximum stress time history diagram of Cologne-egg fastener clips

    图 9  科隆蛋扣件弹条雨流计数分布

    Figure 9.  Rain flow count distribution of Cologne-egg fastener clips

    表  1  轮对-钢轨-扣件系统有限元模型的材料属性[9,18-19]

    Table  1.   Material properties of finite element model of wheel set-rail-fastener system[9,18-19]

    部件 弹性模量/Pa 泊松比 密度/
    (kg•m−3
    轮对 210.00×109 0.30 7800
    钢轨 206.00×109 0.30 7800
    DI弹条 206.00×109 0.30 7800
    轨距垫 6.20×109 0.35 1400
    调高垫板 6.00×106 0.45 1190
    承轨座/底座 170.00×109 0.30 7900
    减振橡胶 5.58×106 0.49 1190
    下载: 导出CSV

    表  2  轮对-钢轨-扣件系统有限元的主要接触属性[18-19]

    Table  2.   Main contact properties of finite element of wheel set-rail-fastener system[18-19]

    接触对 接触方式 主面 从面 摩擦系数
    轮对-轨道 摩擦 轮面 轨面 0.4
    弹条-减振器板 摩擦 弹条 减振器板 0.3
    弹条-轨距块 摩擦 弹条 轨距块 0.7
    轨道-轨距块 绑定 轨距块 轨道
    轨下垫板-
    钢轨
    绑定 轨下垫板 钢轨
    轨下垫板-
    承轨座
    绑定 轨下垫板 承轨座
    下载: 导出CSV
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  • 收稿日期:  2023-01-26
  • 修回日期:  2023-04-27
  • 网络出版日期:  2024-09-14

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