Effect of Rail Hardness on Fatigue Cracks Initiation and Rail Wear

被引：0

作者：

Wang J. ^{[1
,2
]}

Zhou Y. ^{[3
,4
]}

Shen G. ^{[1
]}

机构：

[1] Institute of Rail Transit, Tongji University, Shanghai

[2] China Railway Materials Operation and Maintenance Technology Co., Ltd., Beijing

[3] Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai

[4] Key Laboratory of Rail Infrastructure Durability and System Safety, Shanghai

来源：

Xinan Jiaotong Daxue Xuebao/Journal of Southwest Jiaotong University | 2021年 / 56卷 / 03期

关键词：

Hardness; Rail; Rail type selection; Rolling contact fatigue; Wear;

D O I：

10.3969/j.issn.0258-2724.20190184

中图分类号：

学科分类号：

摘要：

In order to study the relationship between rail hardness and rail wear and fatigue cracks initiation life, based on the Archard wear model and the critical plane fatigue cracks initiation prediction model, the prediction method for the coexistence of rail fatigue cracks initiation and wear was presented by combining wear and sectional iteration of profile changes and fatigue damage accumulation. The wear growth, fatigue damage accumulation and fatigue cracks initiation life of 4 kinds of rails with different hardness were researched. The results show that the fatigue cracks initiation life predicted by above-mentioned method has a good agreement with that of the field observation. The rail with high hardness can reduce wear and prolong the fatigue cracks initiation life, which is suitable for sharp curves. Among the rails with four hardness, the average wear growth rate can be reduced by about 3% − 6% and the fatigue cracks initiation life can be prolonged by about 9% − 12% when the hardness of the rail increases by every 10 HBW. Comparing to the U78CrV/U76CrRE hot rolled rail, the average hardness of the U78CrV heat-treated rail increases by about 17.9% while the wear growth rate reduces by about 19.8% and its fatigue cracks initiation life prolongs by about 57.7%. With the wheel/rail friction coefficient of 0.3, the fatigue cracks are initiated at rail sub-surface which is below rail surface of about 1.0 − 2.5 mm and close to rail top center of about 15 − 18 mm in all 4 kinds of rails. Copyright ©2021 JOURNAL OF SOUTHWEST JIAOTONG UNIVERSITY. All rights reserved.

引用

页码：611 / 618

页数：7

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