高速列车轮轨滚动接触损伤的多因素竞争机理研究

项目名称： 高速列车轮轨滚动接触损伤的多因素竞争机理研究

项目编号： No.11472230

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 江晓禹

作者单位： 西南交通大学

项目金额： 86万元

中文摘要： 轮轨高速滚动接触问题是我国轮轨高速中的重要力学问题，轮轨间的高速滚动接触作用力分布形式对轮轨的接触疲劳与磨耗具有决定性的作用。本研究将发展行之有效的轮轨高速滚动接触理论，建立接触作用力分布理论公式；研究高速列车各种运行状态下的滚动接触过程；构建高速轮轨接触疲劳与磨损等轮轨病害形成机理的多尺度断裂力学理论模型，研究高速轮轨滚动接触磨耗与接触疲劳等损伤的多因素竞争机理，获取宏观裂纹扩展及磨耗的累计量；探索轮轨表面磨损过程中的接触疲劳、磨耗、龟裂等损伤与高速滚动接触作用力分布之间的关系；并通过对高铁典型路段的监测，获取轨道磨损、微裂纹萌生及扩展等监测数据；将监测数据与力学理论结果进行独立的对比论证，确保结果的可靠性。根据宏观的轮轨损伤累计量，建立高效的轮轨接触病害评估指标，为轮轨接触病害的评估方法奠定理论依据；制定合理的轨道打磨周期，确保高铁运营的安全性和经济性，为高铁轮轨的改进提供合理化建议。

中文关键词： 接触力学；摩擦磨损；损伤机理；动力学

英文摘要： With the ripid development of high-speed railway in our countary, some important mechanical problems needs to be sloved in wheel/rail rolling contact. The wheel/rail rolling contact problem is very important. In wheel/rail rolling contact when the wheel rolling at a high speed, the distribution of contact force plays a key role on the contact fatigue and wear of the rail. It will be developed that the effective wheel/rail rolling contact theory for high-speed train. It will be simulated numerically that the dynamic process of wheel/rail rolling contact while the high-speed train moves in different states. The mutil-scale fracture model will be established for understanding the mechanism of rail damage of contact fatigue and wear. It will be explored that the multivariate competition mechanism of wheel/rail rolling contact fatigue, wear and other damage. The damage cumulative amount of wear and fatigue wll be obtained. It will be explored that the relationship between the distribution of contact force and the damage suach as contact fatigue, abrasion and chap on wheel/rail contact surfaces. Through the monitoring of the typical places of high-speed railway, it will be obtained that monitoring data such as the rail wear, micro-crack initiation and propagation, etc. The monitoring data will be compared with the results from mechanical theory to demonstrate the correctness independently and to ensure the reliability of the results. According to the damage cumulative amount of wear and fatigue, the evaluation indicators will be established for the track diseases such as contact fatigue and wear. To lay the theoretical basis of evaluation methods for the wheel/rail contact diseases. It would be developed that a reasonable track grinding cycle to ensure the safety and economy of high-speed railway. The reasonable suggestions will be given for improving the tread of rail and wheel of high-speed railway.

英文关键词： Contact Mechanics;Frictional Wear;Mechanism of Damage;Dynanmics