Research on the Critical Size of Rail Inclusions for Heavy-Haul Railways

被引：0

作者：

Shi T. ^{[1
]}

Peng Q. ^{[2
]}

Liu F. ^{[1
]}

Chen Z. ^{[1
]}

Yu Z. ^{[1
]}

Zhang Q. ^{[2
,3
]}

机构：

[1] Metals and Chemistry Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing

[2] Mechanical and Electrical Engineering College, Qingdao University, Shandong, Qingdao

[3] National Engineering Laboratory for High-Speed Train System Integration, CRRC Qingdao Sifang Co., Ltd., Shandong, Qingdao

来源：

Zhongguo Tiedao Kexue/China Railway Science | 2023年 / 44卷 / 06期

关键词：

Critical Size; Factor regarding size; Fatigue life; Rail inclusions;

D O I：

10.3969/j.issn.1001-4632.2023.06.06

中图分类号：

学科分类号：

摘要：

The increase of train axle load puts forward higher requirements for rail cleanliness. In order to explore the influence laws on inclusions of rail service life, a finite element model of rails was established to analyze the influences of the inclusions’shape, depth and size on rail stress. The influence of inclusions on the fatigue life of rails was also analyzed by FE-SAFE fatigue simulation software and the“radius-length”curve of the rail fatigue damage caused by inclusions was calculated. The results show that smaller inclusions tended to cause local stress concentration in the rail; the larger the distance between the inclusions and the rail tread, the smaller the maximum equivalent stress of the rail; the larger the loaded area of inclusions, the more obvious the influence on rail stress; the inscribed radius of inclusions had more influence on the stress state of the rail. For 25 t axle load, the fatigue life of the rail was inversely proportional to the cube of the inscribed radius of the inclusion, and was inversely proportional to the square of the length of the inclusion. The inscribed radius of the inclusion had more influence on rail fatigue life than its length; the“radius-length”combination of the critical sizes of Al2O3 inclusions at 5 mm under the rail tread were“20 μm-1 620 μm”,“60 μm-395 μm”and“100 μm-207 μm”. Thus, emphasis should be placed on the oversize large inclusions in rail inspection. © 2023 Chinese Academy of Railway Sciences. All rights reserved.

引用

页码：57 / 66

页数：9

共 21 条

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