Failure analysis and optimization of a suspended structure in the power supply system of the subway

被引：7

作者：

Liu, Long ^{[1
]}

Ding, Ning ^{[1
]}

Xu, Na ^{[1
]}

Guo, Weimin ^{[1
]}

Shi, Junbo ^{[1
]}

Li, Nan ^{[1
]}

Zhang, Lijun ^{[2
]}

Meng, Bingchen ^{[2
]}

Zairi, Fahmi ^{[3
]}

机构：

[1] Qilu Univ Technol, Shandong Acad Sci, Shandong Anal & Test Ctr, Engn Res Ctr Failure Anal & Safety Assessment, Jinan 250014, Peoples R China

[2] Shandong Jiaotong Univ, Traff Judicial Identificat Ctr, Jinan 250100, Peoples R China

[3] Lille Univ, Civil Engn & Geoenvironm Lab, ULR 4515 LGCgE, F-59000 Lille, France

来源：

ENGINEERING FAILURE ANALYSIS | 2020年 / 115卷

基金：

中国国家自然科学基金;

关键词：

Dropper; Fatigue; Fracture; Stainless steel wire; Finite element analysis; FATIGUE FAILURE; WIRE ROPE; STEEL;

D O I：

10.1016/j.engfailanal.2020.104619

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The failure mechanism of the fractured droppers used in power supply systems for subway was analyzed with various technologies. Collected evidences indicated that the droppers fracture due to fatigue crack propagation. The chemical composition and mechanical properties of the dropper material were both complied with the normal 304 stainless steel standard. The metallographic examination showed that the microstructure of the failed dropper was normal. The initial region of the fatigue damage was located at a notch near the bending place. Under the cyclic loads caused by the up and downs of the dropper when the train passes by, the crack initiated, propagated and ruptured finally. Results of finite element simulations suggested that the residual force of the droppers will increase as the chamfering radius is. Improving the manufacturing tool was an effective way to reduce the stress concentration and to increase the residual force of the droppers, thus, to improve the service life of the droppers.

引用

页数：7

共 13 条

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