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How can the effect of particle surface roughness on the contact area be predicted?

Lookup NU author(s): Dr Sadegh NadimiORCiD, Vasileios AngelidakisORCiD

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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 (S_q), root mean square gradient (S_dq), short wavevector (q₀), large wavevector (q₁), Hurst exponent (H) and fractal dimension (D_f). 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 S_q, 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.

Publication metadata

Author(s): Nadimi S, Angelidakis V, Otsubo M, Ghanbarzadeh A

Publication type: Article

Publication status: Published

Journal: Computers and Geotechnics

Year: 2022

Volume: 150

Print publication date: 01/10/2022

Online publication date: 12/07/2022

Acceptance date: 25/06/2022

Date deposited: 01/08/2022

ISSN (print): 0266-352X

ISSN (electronic): 1873-7633

Publisher: Elsevier

URL: https://doi.org/10.1016/j.compgeo.2022.104890

DOI: 10.1016/j.compgeo.2022.104890

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