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Effects of dent size on the evolution process of rolling contact fatigue damage on defective rail

journal contribution
posted on 27.10.2021, 05:22 authored by SY Zhang, XJ Zhao, HH Ding, Maksym SpiryaginMaksym Spiryagin, J Guo, QY Liu, WJ Wang, ZR Zhou
Defects such as dents on the rail surface might induce severe rolling contact fatigue (RCF) and then threaten the running safety of railway vehicles. This study aims to explore the initiation and propagation of RCF cracks around dents with different sizes through observing both surfaces and cross-sections of the defective rail. The experiments are conducted on a wheel/rail twin-disc machine. Results indicate that the microstructure evolution process around the dent can be divided into three main stages, namely crack initiation, crack propagation and dent removal. Dents in different sizes act very similarly in each stage, including the position, the crack growth path and the final appearance after the dent has been fully worn off. However, dents in different sizes cause different lifetimes of crack initiation and different lasting times of dents at each stage. For the lager dent, cracks initiate later but propagate for a longer time period, so the dent size plays an important role in the RCF evolution process.

Funding

Category 3 - Industry and Other Research Income

History

Volume

477

Start Page

1

End Page

10

Number of Pages

10

ISSN

0043-1648

Publisher

Elsevier

Language

en

Peer Reviewed

Yes

Open Access

Yes

Acceptance Date

17/03/2021

External Author Affiliations

Southwest Jiaotong University, China

Author Research Institute

Centre for Railway Engineering

Era Eligible

Yes

Journal

Wear

Article Number

203894