How can the effect of particle surface roughness on the contact area be predicted?
File(s)
Published version
Author(s)
Nadimi, Sadegh
Angelidakis, Vasileios
Otsubo, Masahide
Ghanbarzadeh, Ali
Type
Journal Article
Abstract
This paper describes a systematic study of the effect of fractal rough surfaces on the contact area with the aim of advancing contact constitutive laws used in the Discrete Element Method. An in-house Boundary Element code is adopted to investigate the mechanical behaviour of computer-generated surface roughness. Surfaces are generated to have methodically controlled root mean square height (Sq), root mean square gradient (Sdq), short wavevector (q0), large wavevector (q1), Hurst exponent (H) and fractal dimension (Df). The effect of each parameter on the contact area is investigated. Two recently proposed analytical solutions in tribology (i.e. Persson-Tosatti and Pastewka-Robbins) are applied to predict the real contact area. A parameter based on Sq, q0, and H is proposed and its sensitivity for real contact area prediction is demonstrated. Surfaces of natural sand are simulated and their mechanical response shows similar trend as the computer-generated surfaces, albeit more complex.
Date Issued
2022-10-01
Date Acceptance
2022-06-25
Citation
Computers and Geotechnics, 2022, 150
ISSN
0266-352X
Publisher
Elsevier
Journal / Book Title
Computers and Geotechnics
Volume
150
Copyright Statement
© 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
License URL
Publication Status
Published
Article Number
104890
Date Publish Online
2022-07-12