Crack Propagation and Rail Surface Spalling Mechanism Based on Peridynamics

被引：0
作者：
Cheng Z. [1 ,2 ]
Zhou Y. [1 ,2 ]
Li J. [1 ,2 ]
Huang X. [3 ]
机构：
[1] Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai
[2] Shanghai Key Laboratory of Rail Transit Structure Endurance and System Safety, Tongji University, Shanghai
[3] Shanghai Tunnel Engineering & Rail Transit Design and Research Institute, Shanghai
来源：
Tongji Daxue Xuebao/Journal of Tongji University | 2023年 / 51卷 / 06期
关键词：
crack propagation; peridynamics; rail; railway; spalling;
D O I：
10.11908/j.issn.0253-374x.22045
中图分类号：
学科分类号：
摘要：
Rail surface rolling contact fatigue （RCF）crack propagation model based on state peridynamics was established to research the propagation of RCF crack and the formation process of spalling. It was found that the crack propagation path gradually turned towards into the internal rail with the accumulation of traffic tonnage in the case of single crack or cracks with distance longer than 1.5 mm between each other. The propagation rate gradually decreases with the increase of traffic tonnage and crack length. In the case of multiple cracks，the cracks propagated along their length direction below traffic tonnage of about 8.8 Mt. After the traffic exceeded 8.8 Mt，the secondary damage between cracks was formed especially between the cracks which their distance was less than 1.5 mm. If the distance between cracks was longer than 1.5 mm，the interaction among cracks was reduced. In the case of multiple cracks with adjacent distance less than 1.5 mm，the spalling occurred from the secondary damage when the increment of traffic tonnage reached a certain amount（>10.0 Mt）. At that time，the spalling depth was about over 1/2 depth of the crack. © 2023 Science Press. All rights reserved.
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页码：912 / 922
页数：10
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