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Lookup NU author(s): Dr Sadegh Nadimi
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Particles slide and roll on each other when a granular medium is sheared. Consequently, the tribological properties, such as inter-particle friction and adhesion, play a major role in influencing their bulk failure and rheology. Although the influence of roughness on adhesion and friction of contacting surfaces is known, the incorporation of the surface roughness in the numerical modelling of granular materials has received little attention. In this study, the Boundary Element Method (BEM), which is widely used for simulating the mechanics of interacting surfaces, is coupled with Discrete Element Method (DEM) and the bulk deformation of granular materials is analysed. A BEM code, developed in-house, is employed to calculate the normal force-displacement behaviour for rough contact deformations, based on which a contact model is proposed. This is an efficient and relatively fast method of calculating the contact mechanics of rough surfaces. The resulting model is then implemented in the simulations by DEM to determine the effect of micro-scale surface roughness on the bulk compression of granular materials. This study highlights the importance of the effect of surface characteristics on contact behaviour of particles for the case of shallow footing and provides an efficient approach for modelling the flow behaviour of a large number of rough particles.
Author(s): Nadimi S, Ghanbarzadeh A, Neville A, Ghadiri M
Publication type: Article
Publication status: Published
Journal: Computational Particle Mechanics
Print publication date: 01/05/2020
Online publication date: 11/10/2019
Acceptance date: 30/09/2019
Date deposited: 01/10/2019
ISSN (print): 2196-4378
ISSN (electronic): 2196-4386
Publisher: Springer Nature
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