Friction and wear in railway ballast stone interfaces

Bettina Suhr; Thomas Butcher; Roger Lewis; Klaus Six

doi:10.1016/j.triboint.2020.106498

Friction and wear in railway ballast stone interfaces

Bettina Suhr^*, Thomas Butcher, Roger Lewis, Klaus Six

^*Corresponding author for this work

Working Group areaD

Research output: Contribution to journal › Article › peer-review

Abstract

Particle friction in railway ballast influences strongly the behaviour of ballasted tracks. New challenges posed on railway infrastructure increase the requirement for simulations, which need the friction coefficient as an input parameter. Measured friction coefficients of ballast stone contacts were found only in two studies, both under constant loads. In this work, two types of ballast were investigated in cyclic friction tests with incremental increase of the applied load after several cycles. Before each load increase, 3D-scans of some ballast stones allowed to calculate the contact area. Estimating the stress in the contact, the stress-dependency of the friction coefficient and wear were investigated. These experimental observations are discussed regarding their impact for friction modelling in the simulation of railway ballast.

Original language	English
Article number	106498
Journal	Tribology International
Volume	151
DOIs	https://doi.org/10.1016/j.triboint.2020.106498
Publication status	Published - Nov 2020

Keywords

Contact area
Friction measurement
Sliding friction
Wear model

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Surfaces, Coatings and Films
Surfaces and Interfaces

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title = "Friction and wear in railway ballast stone interfaces",

abstract = "Particle friction in railway ballast influences strongly the behaviour of ballasted tracks. New challenges posed on railway infrastructure increase the requirement for simulations, which need the friction coefficient as an input parameter. Measured friction coefficients of ballast stone contacts were found only in two studies, both under constant loads. In this work, two types of ballast were investigated in cyclic friction tests with incremental increase of the applied load after several cycles. Before each load increase, 3D-scans of some ballast stones allowed to calculate the contact area. Estimating the stress in the contact, the stress-dependency of the friction coefficient and wear were investigated. These experimental observations are discussed regarding their impact for friction modelling in the simulation of railway ballast.",

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N2 - Particle friction in railway ballast influences strongly the behaviour of ballasted tracks. New challenges posed on railway infrastructure increase the requirement for simulations, which need the friction coefficient as an input parameter. Measured friction coefficients of ballast stone contacts were found only in two studies, both under constant loads. In this work, two types of ballast were investigated in cyclic friction tests with incremental increase of the applied load after several cycles. Before each load increase, 3D-scans of some ballast stones allowed to calculate the contact area. Estimating the stress in the contact, the stress-dependency of the friction coefficient and wear were investigated. These experimental observations are discussed regarding their impact for friction modelling in the simulation of railway ballast.

AB - Particle friction in railway ballast influences strongly the behaviour of ballasted tracks. New challenges posed on railway infrastructure increase the requirement for simulations, which need the friction coefficient as an input parameter. Measured friction coefficients of ballast stone contacts were found only in two studies, both under constant loads. In this work, two types of ballast were investigated in cyclic friction tests with incremental increase of the applied load after several cycles. Before each load increase, 3D-scans of some ballast stones allowed to calculate the contact area. Estimating the stress in the contact, the stress-dependency of the friction coefficient and wear were investigated. These experimental observations are discussed regarding their impact for friction modelling in the simulation of railway ballast.

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KW - Wear model

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Friction and wear in railway ballast stone interfaces

Abstract

Keywords

ASJC Scopus subject areas

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