AN INVESTIGATION OF THE MICRO-MECHANICAL CONTACT BEHAVIOUR OF RAILWAY BALLAST PARTICLES

Aziz U. Hakimi; Saurabh Singh; Béatrice A. Baudet; Matthew R. Coop

doi:10.1088/1755-1315/1480/1/012020

AN INVESTIGATION OF THE MICRO-MECHANICAL CONTACT BEHAVIOUR OF RAILWAY BALLAST PARTICLES

Aziz U. Hakimi
, Saurabh Singh
, Béatrice A. Baudet
, Matthew R. Coop

University of Hertfordshire

Research output: Contribution to journal › Conference article › peer-review

Abstract

The micromechanical behaviour of basalt ballast particles was studied by subjecting them to normal (N) and tangential loading (T) under various loads. It is observed that the natural ballast particle pairs subjected to normal loading have a softer response than that predicted by Hertz (1882) theory. The coefficient of interparticle friction (μ), measured during monotonic shearing, is about 0.5-0.6, while during cyclic loading, μ was found to stabilise around 0.65-0.85 after about 30 cycles. The value of μ was not affected by the normal load or the loading rate. Roughness, measured before and after testing, was found to change with loading, attributed to deformation of the asperities.

Original language	English
Article number	012020
Journal	IOP Conference Series: Earth and Environmental Science
Volume	1480
Issue number	1
DOIs	https://doi.org/10.1088/1755-1315/1480/1/012020
Publication status	Published - 2025
Event	5th International Symposium on Geomechanics from Micro to Macro, IS-Grenoble 2024 - Grenoble, France Duration: 23 Sept 2024 → 27 Sept 2024

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10.1088/1755-1315/1480/1/012020

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title = "AN INVESTIGATION OF THE MICRO-MECHANICAL CONTACT BEHAVIOUR OF RAILWAY BALLAST PARTICLES",

abstract = "The micromechanical behaviour of basalt ballast particles was studied by subjecting them to normal (N) and tangential loading (T) under various loads. It is observed that the natural ballast particle pairs subjected to normal loading have a softer response than that predicted by Hertz (1882) theory. The coefficient of interparticle friction (μ), measured during monotonic shearing, is about 0.5-0.6, while during cyclic loading, μ was found to stabilise around 0.65-0.85 after about 30 cycles. The value of μ was not affected by the normal load or the loading rate. Roughness, measured before and after testing, was found to change with loading, attributed to deformation of the asperities.",

author = "Hakimi, \{Aziz U.\} and Saurabh Singh and Baudet, \{B{\'e}atrice A.\} and Coop, \{Matthew R.\}",

note = "Publisher Copyright: {\textcopyright} Published under licence by IOP Publishing Ltd.; 5th International Symposium on Geomechanics from Micro to Macro, IS-Grenoble 2024 ; Conference date: 23-09-2024 Through 27-09-2024",

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doi = "10.1088/1755-1315/1480/1/012020",

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journal = "IOP Conference Series: Earth and Environmental Science",

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T1 - AN INVESTIGATION OF THE MICRO-MECHANICAL CONTACT BEHAVIOUR OF RAILWAY BALLAST PARTICLES

AU - Hakimi, Aziz U.

AU - Singh, Saurabh

AU - Baudet, Béatrice A.

AU - Coop, Matthew R.

N1 - Publisher Copyright: © Published under licence by IOP Publishing Ltd.

PY - 2025

Y1 - 2025

N2 - The micromechanical behaviour of basalt ballast particles was studied by subjecting them to normal (N) and tangential loading (T) under various loads. It is observed that the natural ballast particle pairs subjected to normal loading have a softer response than that predicted by Hertz (1882) theory. The coefficient of interparticle friction (μ), measured during monotonic shearing, is about 0.5-0.6, while during cyclic loading, μ was found to stabilise around 0.65-0.85 after about 30 cycles. The value of μ was not affected by the normal load or the loading rate. Roughness, measured before and after testing, was found to change with loading, attributed to deformation of the asperities.

AB - The micromechanical behaviour of basalt ballast particles was studied by subjecting them to normal (N) and tangential loading (T) under various loads. It is observed that the natural ballast particle pairs subjected to normal loading have a softer response than that predicted by Hertz (1882) theory. The coefficient of interparticle friction (μ), measured during monotonic shearing, is about 0.5-0.6, while during cyclic loading, μ was found to stabilise around 0.65-0.85 after about 30 cycles. The value of μ was not affected by the normal load or the loading rate. Roughness, measured before and after testing, was found to change with loading, attributed to deformation of the asperities.

UR - https://www.scopus.com/pages/publications/105003381443

U2 - 10.1088/1755-1315/1480/1/012020

DO - 10.1088/1755-1315/1480/1/012020

M3 - Conference article

AN - SCOPUS:105003381443

SN - 1755-1307

VL - 1480

JO - IOP Conference Series: Earth and Environmental Science

JF - IOP Conference Series: Earth and Environmental Science

IS - 1

M1 - 012020

T2 - 5th International Symposium on Geomechanics from Micro to Macro, IS-Grenoble 2024

Y2 - 23 September 2024 through 27 September 2024

ER -

AN INVESTIGATION OF THE MICRO-MECHANICAL CONTACT BEHAVIOUR OF RAILWAY BALLAST PARTICLES

Abstract

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