Effects of Grinding Marks on Fatigue Damage of Rails under Water Conditions

被引：1
|
作者：
Guo S. [1 ]
Zhao X. [1 ]
He C. [1 ]
Liu Q. [1 ]
Guo J. [1 ]
Wang W. [1 ]
机构：
[1] Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu
来源：
Zhongguo Jixie Gongcheng/China Mechanical Engineering | 2019年 / 30卷 / 08期
关键词：
Crack propagation; Fatigue crack; Grinding marks direction; Rail; Water medium;
D O I：
10.3969/j.issn.1004-132X.2019.08.002
中图分类号：
学科分类号：
摘要：
The object herein was to investigate the effects of different grinding marks directions on the rail fatigue crack propagations under water medium conditions using a MMS-2A wheel/rail friction wear testing apparatus. And the different grinding marks angles to the running direction were manufactured on rail specimens by brown corundum sand. The results indicate that the surface roughness of rail specimen with the grinding marks angle of 0° ~45° to the running direction is higher than that with the grinding marks angle of 7°and 90° under the water medium conditions. The grinding marks with the angle of 0°~45° to the running direction may accelerate the fatigue crack propagations compared with the smooth area on rail specimen without prefabricated grinding marks. And the crack propagation is particularly serious on the rail specimen surface with the angle of 20° grinding marks which has a lot of branch cracks. The growth of the fatigue cracks slows down for the rail specimen with the grinding marks angle of 70°, 90°, and there are only surface cracks on the rail specimen with the angle of 90° grinding marks. With the angle of grinding marks increases from 0° to 90°, the crack propagation depth of rail specimen increases firstly and then decreases, and the crack propagation angle tends to decrease gradually. © 2019, China Mechanical Engineering Magazine Office. All right reserved.
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页码：889 / 895
页数：6
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