利用断裂力学理论建立了钢轨踏面斜裂纹扩展寿命预测模型;以CRH2型动车组为研究对象,计算了轮轨接触时钢轨内部的应力分布,然后利用预测模型估算了钢轨踏面斜裂纹的扩展寿命,并分析了摩擦因数、裂纹倾斜角、钢轨磨损率等因素对钢轨踏面斜裂纹扩展寿命的影响。结果表明：倾斜角在30°～40°时,斜裂纹扩展寿命随摩擦因数的增大而降低;裂纹倾斜角增加到50°～60°时,斜裂纹扩展寿命先增加后减小;随裂纹倾斜角的增大,斜裂纹扩展寿命先增后减;斜裂纹扩展寿命随磨损率增大先缓慢增加,当磨损率达到一定值后急剧增加;实际使用数据间接证明了模型预测的准确性。
The prediction model of propagation life of oblique crack on rail′s surface was established by the fracture mechanics theory.Taking CRH2 train-set as research object,stress distribution in the internal of rail when wheel and rail contacted was calculated,and then the propogation life of oblique crack on rail surface was estimated by using above modle.Furthermore,the effects of friction factor,inclination angle and wear rate on the propagation life of rail surface oblique crack were analyzed.The results show that the oblique crack propagation life decreased with the increase of friction factor when the inclination was 30°-40°,and the oblique crack propagation life first increased then decreased when the inclination angle was 50°-60°.With the increase of inclination angles,the oblique crack propagation life increased,then decreased.The oblique crack propagation life increased slowly with the increase of wear rate,and then increased rapidly when the wear rate up to a constant value.Fact data could prove indirectly the accurate of prediction.
参考文献
| [1] | 赵雪芹,王文健,郭俊,刘启跃.广深线PD3与U71Mn钢轨斜裂纹形成特性分析[J].润滑与密封,2007(03):35-37,42. |
| [2] | 于建武,马超,李志鹏.京九线钢轨顶面斜裂纹的成因及整治[J].铁道运输与经济,2008(08):90-91. |
| [3] | 刘学文,邹定强,邢丽贤,田常海,卢观健.钢轨踏面斜裂纹伤损原因及对策的研究[J].中国铁道科学,2004(02):82-87. |
| [4] | 吴庆记.重型钢轨轨端裂纹失效机制探讨[J].兰州铁道学院学报,1999(01):55-60. |
| [5] | D. Canadinc;H. Sehitoglu;K. Verzal .Analysis of surface crack growth under rolling contact fatigue[J].International Journal of Fatigue,2008(9):1678-1689. |
| [6] | Uwe Zerbst;Manfred Schodel;Rene Heyder .Damage tolerance investigations on rails[J].Engineering Fracture Mechanics,2009(17):2637-2653. |
| [7] | 李晓宇,习年生,周清跃.轮轨接触位置对钢轨斜裂纹扩展行为影响的仿真[J].中国铁道科学,2008(02):44-47. |
| [8] | 钟雯,赵雪芹,王文健,刘启跃.PD3与U71Mn钢轨疲劳裂纹扩展特性研究[J].中国机械工程,2008(14):1740-1743. |
| [9] | 胡家杰,钟雯,刘启跃.PD3和U71Mn钢轨钢的弯-弯疲劳裂纹扩展特性[J].机械工程材料,2010(04):58-61. |
| [10] | 张东涛,安天生.钢轨中的残余应力[J].铁道物资科学管理,2001(04):21-23. |
| [11] | Jonas W. Ringsberg .Shear mode growth of short surface-breaking RCF cracks[J].Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear,2005(7/8):955-963. |
| [12] | 王文健,李郭俊,刘启跃,朱旻昊.磨损对钢轨滚动接触疲劳损伤的影响[J].机械工程材料,2010(01):17-19,23. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%