钢轨滚动接触疲劳裂纹萌生和磨耗共存预测方法验证
Verification of Prediction Method for Coexistence of Rolling Contact Fatigue Crack Initiation and Wear Growth in Rail
投稿时间:2020-09-30  
DOI:10.11908/j.issn.0253-374x.20402     稿件编号:    中图分类号:U213.42
 

 中文关键词:钢轨  滚动接触疲劳  裂纹萌生  磨耗  小比例轮轮试验

 英文关键词:rail  rolling contact fatigue  crack initiation  wear  small scale wheel-wheel experiment

 
作者单位邮编
周宇 同济大学 道路与交通工程教育部重点实验室上海 201804
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 
201804
王钲 同济大学 道路与交通工程教育部重点实验室上海 201804
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 
201804
卢哲超 同济大学 道路与交通工程教育部重点实验室上海 201804
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 
201804
梁旭 中国铁道科学研究院集团有限公司 金属及化学研究所北京 100081 100081
李骏鹏 同济大学 道路与交通工程教育部重点实验室上海 201804
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 
201804
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中文摘要
      采用小比例轮轮滚动接触疲劳试验再现钢轨裂纹萌生和磨耗过程,根据钢轨裂纹萌生和磨耗共存预测方法结合试验条件建立相应的预测模型,分别对试验和仿真预测的钢轨试样磨耗、裂纹萌生寿命和启裂角度等进行比对,从而验证钢轨裂纹萌生和磨耗共存预测方法。研究发现:当试样萌生裂纹时,有53.8%的试样经历了2个磨耗阶段,平均磨耗发展率约为5.83 μm·10-4-1;预测的试样在萌生裂纹前经历了2次磨耗阶段,平均磨耗发展率约为5.18 μm·10-4-1,较试验结果低约11.1 %;试验中试样裂纹萌生寿命在6×104 ~ 14×104次范围内,且裂纹长度在荷载循环次数在11×104 ~ 12×104次时达到极大值,预测的裂纹萌生寿命为11.1×104次,基本与试验结果中裂纹萌生时出现极大值的试样所对应的荷载作用次数接近。试验观测到试样表面裂纹开口与滚动方向的角度平均值约为45°;仿真预测的裂纹开口与滚动方向的角度平均值基本与观测到的裂纹开口与滚动方向的角度一致。
英文摘要
      A small-scale wheel-wheel rolling contact fatigue (RCF) experiment was applied to reproduce the rail RCF crack initiation and wear growth process. Then, according to the experimental conditions, the prediction model was established based on the method for the coexistence of rail rolling contact fatigue(RCF) crack initiation and wear growth. The wear, crack initiation life and the angle of the RCF crack in the rail specimens of the experiment and simulation were compared to verify the method. The result shows that when the crack initiated in the specimen surface during the experiment, 53.8 % of the specimen experiences two wear phases. The average wear growth rate is about 5.83 μm·10-4 cycles-1. In the simulation, there are also two wear phases when the crack was initiated. The average wear growth rate is about 5.18 μm·10-4 cycles-1 which is about 11.1 % lower than the experimental results. In the experiment, the crack initiation life is about 6×104 to 14×104 cycles. Moreover, the crack length reaches its maximum value when the loading cycles is about 11×104 to 12×104 cycles. In the simulation, the predicted crack initiation life is about 11.1×104 cycles, which is close to that of the specimen with the maximum crack length in the experiment. It is observed that the average value of the angle between the crack mouth and the running direction along the specimen surface is about 45°which is close to that of simulation.
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