高速道岔曲尖轨疲劳裂纹成因分析
作者:
作者单位:

1.同济大学 道路与交通工程教育部重点实验室,上海 201804;2.同济大学 上海市轨道交通结构耐久与系统安全重点实验室,上海 201804;3.上海市隧道工程轨道交通设计研究院,上海 200235;4.中国铁道科学研究院集团有限公司 铁道建筑研究所,北京 100081

作者简介:

周宇(1977—),男,副教授,博士生导师,工学博士,主要研究方向为钢轨伤损、轨道结构。E-mail:yzhou2785@tongji.edu.cn

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基金项目:

国家自然科学基金(51678445,51878661);中国铁路总公司科技研究开发计划重点课题(N2018G042)


Cause of Rolling Contact Fatigue Cracks in Curved Switch Rail of High- speed Turnout
Author:
Affiliation:

1.Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China;2.Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, Shanghai 201804, China;3.Shanghai Tunnel Engineering & Rail Transit Design and Research Institute, Shanghai 200235, China;4.Railway Engineering Research Institute, China Academy of Railway Sciences Co. Ltd., Beijing 100081, China

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    摘要:

    根据高速铁路18号单开道岔的基本轨-曲尖轨设计廓形和实测廓形数据,采用车辆-道岔动力学模型,分析了列车逆向-侧向过岔时轮载位置的转移、基本轨和尖轨上的接触斑法向应力和疲劳裂纹指数,提出了高速道岔曲尖轨疲劳裂纹形成的原因。研究发现:高速道岔基本轨和尖轨实测廓形显示尖轨降低值存在不足,使得同一转向架1、2位轮对的外轮轮载转移分别过早和过快,且随着车轮和钢轨廓形磨耗,这种情况进一步恶化。由此造成曲尖轨受到较大的法向接触应力,特别是1位轮对的外轮对曲尖轨轨肩和轨距角疲劳裂纹的形成贡献度最大。曲尖轨最早出现裂纹的区域在其顶宽20~50mm范围内。

    Abstract:

    According to the designed and the measured stock and curved switch rail profiles of the No. 18 high-speed single-way turnout, a vehicle-turnout dynamic model was established to analyze the wheel loading position transfer, normal contact stress in the stock and curved switch rails and their fatigue damage indexes during train passing turnout along reverse and side direction. The reason that the fatigue crack in curved switch rail was presented. The results show that the switch rail machined depth to the stock rail was not as enough as the standard one which made the loading position transferred early and rapidly for the outer wheels of both the front and rear wheelsets in the same bogie respectively. With the wear’s coming into being between the wheel and rail profiles, this situation got worse. Then, large normal contact stress occurred in the curved switch rail especially by the outer wheel of the front wheelset in the bogie which contributed the most to the rolling contact fatigue crack at the gauge shoulder and corner of the curved switch rail. The fatigue crack would appear first in the curved switch rail with the top width of about 20 ~ 50 mm.

    图1 尖轨-基本轨实测廓形与设计廓形对比Fig.1 Comparison between the designed and the measured profiles of the switch rail
    图2 实测廓形与设计廓形轮轨接触对比Fig.2 Comparison of wheel-rail contact with designed and measured profiles of the switch rail
    图3 基本轨-尖轨廓形建模Fig.3 Modeling of the stock and switch rails
    图4 Fig.4 Vertical wheel force on curved switch rail
    图5 轮轨垂向力Fig.5 Vertical wheel-rail force
    图6 轮轨横向力Fig.6 Lateral wheel-rail force
    图7 实测磨耗LMB车轮与实测钢轨廓形下的轮轨垂向力Fig.7 Vertical wheel-rail force between the measured LMB wheel and rail profiles
    图8 轮轨接触位置Fig.8 Wheel-rail contact position
    图9 设计廓形与1位轮对外轮接触的最大法向应力Fig.9 The maximum normal pressure of front wheel on the designed profiles
    图10 设计廓形与2位轮对外轮接触的最大法向应力Fig.10 The maximum normal pressure of rear wheel on the designed profiles
    图11 实测廓形与1位轮对外轮接触的最大法向应力Fig.11 The maximum normal pressure of front wheel on the measured profiles
    图12 实测廓形与2位轮对外轮接触的最大法向应力Fig.12 The maximum normal pressure of rear wheel on the measured profiles
    图13 疲劳指数Fig.13 Fatigue index
    图14 现场曲尖轨疲劳裂纹Fig.14 Fatigue cracks on curved switch rail
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引用本文

周宇,张聪聪,王树国,王璞.高速道岔曲尖轨疲劳裂纹成因分析[J].同济大学学报(自然科学版),2020,48(12):1770~1781

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  • 收稿日期:2020-05-17
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  • 在线发布日期: 2020-12-31