Damage tolerance of fractured rails on continuous welded rail track for high-speed railways

Broken gap is an extremely dangerous state in the service of high-speed rails, and the violent wheel–rail impact forces will be intensified when a vehicle passes the gap at high speeds, which may cause a secondary fracture to rail and threaten the running safety of the vehicle. To recognize the damage tolerance of rail fracture length, the implicit–explicit sequential approach is adopted to simulate the wheel–rail high-frequency impact, which considers the factors such as the coupling effect between frictional contact and structural vibration, nonlinear material and real geometric profile. The results demonstrate that the plastic deformation and stress are distributed in crescent shape during the impact at the back rail end, increasing with the rail fracture length. The axle box acceleration in the frequency domain displays two characteristic modes with frequencies around 1,637 and 404 Hz. The limit of the rail fracture length is 60 mm for high-speed railway at a speed of 250 km/h.

Record URL:
Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/26624745
Supplemental Notes:
- © 2021 Yuan Gao et al.
Authors:
- Gao, Yuan
- Wang, Ping
- Wang, Kai
- Xu, Jingmang
- Dong, Zhiguo
Publication Date: 2020-12

Language

English

Media Info

Media Type: Digital/other
Features: Figures; Photos; References; Tables;
Pagination: pp 59–73
Serial:
- Railway Engineering Science
- Volume: 29
- Issue Number: 1
- Publisher: Springer Nature
- ISSN: 2662-4745
- Serial URL: https://www.springer.com/journal/40534

Subject/Index Terms

TRT Terms: Continuous welded rail; Engineering tolerance; Fracture mechanics; High speed rail; Impact; Rolling contact; Stresses
Subject Areas: Maintenance and Preservation; Railroads;

Filing Info

Accession Number: 01769301
Record Type: Publication
Files: TRIS
Created Date: Apr 9 2021 5:33PM