首页> 外文期刊>Journal of thermal stresses >FATIGUE ANALYSIS OF RAILWAY WHEELS UNDER COMBINED THERMAL AND MECHANICAL LOADS
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FATIGUE ANALYSIS OF RAILWAY WHEELS UNDER COMBINED THERMAL AND MECHANICAL LOADS

机译:组合载荷作用下的铁路车轮疲劳分析。

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摘要

Nowadays, the railway vehicles are widely used in many countries as one of the most important transportation systems. Nucleation and growth of fatigue cracks in railway wheels stem from different factors such as wheel-rail rolling contact, thermal loads between wheel-rail and wheel-brake block created in braking process, presence of structural defects in wheel material, and so forth. Also, increasing speed and axle loads of wheels aggravates these factors. These cracks can reduce wheel life and even in severe cases derailment may occur. Therefore, the thermo-mechanical fatigue problem of wheels is a very important issue as is doing an accurate mechanical and thermal analysis of the investigation and estimation of fatigue life of wheels, and also, the prediction of crack behavior under thermo-mechanical loads is necessary. In this article, stress fields created by combined thermal and mechanical loads in railway wheels is investigated. Thermal stresses are usually created as a result of frictional heating produced by applying brake shoes on the wheel tread and also as a result of the occurrence of slip between wheel and rail at the braking stage. The obtained results confirm the important effects of thermal loads on stress fields and fatigue life of wheels. In this article, thermal loads are determined by modeling the contact of the rail-wheel and two brake blocks and by identifying heat partition factors and friction coefficient between these components. One of the other advantages of the presented work is modeling of wheel rotation, while in many of the similar investigations either this rolling is not modeled or its effect is simplified as translating pressure distribution along the rail-wheel contact region. The use of a 3D FE analysis for determination of rail-wheel contact pressure instead of Hertz contact theory is also noteworthy.
机译:如今,铁路车辆作为最重要的运输系统之一在许多国家被广泛使用。铁路车轮疲劳裂纹的形核和增长源于不同的因素,例如轮轨滚动接触,制动过程中在轮轨和车轮制动块之间产生的热负荷,车轮材料中存在结构缺陷等。同样,增加车轮的速度和轴载荷会加剧这些因素。这些裂纹会缩短车轮寿命,甚至在严重的情况下也可能发生脱轨。因此,车轮的热机械疲劳问题是一个非常重要的问题,对车轮的疲劳寿命的研究和估计进行精确的机械和热分析也很重要,而且,在热机械载荷下预测裂纹行为也是必要的。 。在本文中,研究了由铁轮中的热负荷和机械负荷共同产生的应力场。热应力通常是由于在车轮胎面上施加制动蹄而产生的摩擦加热而产生的,并且还由于在制动阶段车轮与钢轨之间发生了打滑而产生。获得的结果证实了热负荷对车轮的应力场和疲劳寿命的重要影响。在本文中,通过对车轮和两个制动块的接触进行建模并确定热量分配因子和这些组件之间的摩擦系数来确定热负荷。提出的工作的另一个优点之一是对车轮旋转进行建模,而在许多类似的研究中,要么不对这种滚动进行建模,要么简化其沿轨道车轮接触区域的压力分布的效果。值得注意的是,使用3D FE分析来确定车轮接触压力而不是赫兹接触理论。

著录项

  • 来源
    《Journal of thermal stresses》 |2014年第3期|34-50|共17页
  • 作者单位

    Center of Excellence in Railway Transportation, School of Railway Engineering, Iran University of Science and Technology, Tehran, Iran;

    Center of Excellence in Railway Transportation, School of Railway Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Braking process; Fatigue life; Railway wheels; Thermo-mechanical loads;

    机译:制动过程;疲劳生活;铁路车轮;热机械载荷;
  • 入库时间 2022-08-18 00:27:56

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