弯矩作用下钢轨滚动疲劳裂纹扩展行为研究  

Research on the Growth Behavior of Rolling Contact Fatigue Crack of Rail Steel under Bending Moment Condition

作　　者：曾庆飞[1] 申鹏[1] 王文健[1] 刘启跃[1] 

机构地区：[1]西南交通大学摩擦学研究所,四川成都610031

出　　处：《润滑与密封》2011年第10期33-36,48,共5页Lubrication Engineering

基　　金：国家高技术研究发展计划(863计划)资助项目(2009AA04Z424);国家自然科学基金项目(50875221);国家科技支撑计划项(2009BAG12A01-B05-1)

摘　　要：在JD-1轮轨模拟试验机上,通过设计模拟小轮的结构,对钢轨试样在弯矩作用下的裂纹扩展行为进行研究。试验结果表明:裂纹一般在应力集中处萌生,当裂纹扩展到一定程度后容易产生变向甚至分叉;在其他参数相同的情况下,预制裂纹尺寸对疲劳裂纹扩展有较大影响,预制裂纹较宽时裂纹扩展速率明显加快。The growth behavior of fatigue crack of rail steel under bending moment condition was investigated using JD-1 rail-wheel simulating machine by designing the structure of small simulating wheel. The result shows that the crack usually initiates in the stress concentration position, and the direction of the growth is easy to change or bifurcate when the growth arrives at a certain extent. The size of pre-crack has great influence on the growth behavior of fatigue crack when other parameters are identical, and the pre-crack with greater width has a significantly faster growth rate in the crack propagation.

关 键 词：钢轨 弯矩 疲劳裂纹扩展 滚动接触 

分 类 号：U213.4[交通运输工程—道路与铁道工程]