A new mechanical–electrical approach to the wheel-rail contact

TitreA new mechanical–electrical approach to the wheel-rail contact
Type de publicationJournal Article
Year of Publication2008
AuteursDescartes, S., M. Renouf, N. Fillot, B. Gautier, A. Descamps, Y. Berthier, and P. Demanche
JournalWear
Volume265
Ticket9-10
Pagination1408 - 1416
Date Published10/2008
ISSN00431648
Résumé

The need to understand the short-circuit phenomenon between two rails brought into contact by a train has led to a new mechanical–electrical approach to the wheel-rail contact based on tribological analysis. Contact between the wheel and rail generates a layer called the “third-body”, composed of particles detached from the two bodies in contact. It can be sheared through its thickness and become the location of substantial velocity gradients. The electrical resistance of this third body is investigated in order to identify possible electrical problems. Consequently, an Atomic Force Microscope (AFM) is used to distinguish the zones of different electrical conductivity. Due to the difficulty of measuring local characteristics inside the contact, the electrical effects are incorporated in numerical simulations using a Discrete Element Method (DEM). Directions for understanding the short-circuit mechanism in the wheel-rail contact are given, underlining the multi-scale and multi-physical aspects of the problem.

DOI10.1016/j.wear.2008.02.040
Short TitleWear
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