轮轨滚动接触疲劳裂纹扩展路径研究
门天龙，师陆冰，王文健，刘启跃
（西南交通大学 摩擦学研究所，四川 成都 610031）
摘要：基于近场动力学理论方法，通过建立轮轨滚动接触二维模型，研究轮轨滚动接触疲劳裂纹扩展情况。计算模型的研究焦点集中在裂纹的扩展路径，并定性地研究不同的参数，如初始裂纹角、初始裂纹长度和表面摩擦系数对裂纹扩展路径的影响。分析结果表明：小角度裂纹转向表面，表现出剥落趋势，而较大的初始角度裂纹继续向下扩展到钢轨内部，更易造成钢轨的整体断裂；长度1.5 mm和3 mm裂纹扩展的结果非常相似，即初始裂纹长度对实际裂纹路径影响相当小；对于摩擦系数较低的情况，与具有较高摩擦系数的情况相比，裂纹较早地转向表面。
关键词：近场动力学；轮轨；滚动接触；疲劳裂纹
中图分类号：U213.4+2 文献标志码：A doi：10.3969/j.issn.1006-0316.2018.09.010
文章编号：1006－0316 (2018) 09－0059－05
Research on Crack Propagation Path of Wheel-Roll Rolling Contact Fatigue
MEN Tianlong，SHI Lubing，WANG Wenjian，LIU Qiyue
( Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China )
Abstract：Based on the peridynamics theory, the rolling contact fatigue crack propagation of wheel-rail is studied by establishing a two-dimensional model of wheel-rail rolling contact. The research focus of the computational model focuses on the crack propagation path, and qualitatively study the effect of different parameters, such as the initial crack angle, the initial crack length and the surface friction coefficient on the crack propagation path. The results show that the small angle cracks turned towards the surface indicating spalling while larger initial angle cracks continued to grow downwards into the rail, which is more likely to cause the overall fracture of the rail; the results of crack propagation of lengths of 1.5 mm and 3 mm are very similar, i.e., the initial crack length has a relatively small effect on the actual crack path; for cases with a lower coefficient of friction the cracks turned towards the surface earlier as compared to cases with higher coefficient of friction.
Key words：peridynamics；wheel and rail；rolling contact；fatigue crack
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收稿日期：2018－07－02
基金项目：四川省高校科研创新团队资助项目（18TD0005）；牵引动力国家重点实验室自主研究课题（2018TPL-T02）
作者简介：门天龙（1994－），男，河南永城人，硕士研究生，主要研究方向为轮轨滚动接触疲劳。
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