Friction of flat and micropatterned interfaces with nanoscale roughness

Bin Jaber, S., Hamilton, A., Xu, Y. , Kartal, M. E., Gadegaard, N. and Mulvihill, D. M. (2021) Friction of flat and micropatterned interfaces with nanoscale roughness. Tribology International, 153, 106563. (doi: 10.1016/j.triboint.2020.106563)

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Abstract

The dry friction of surfaces with nanoscale roughness and the possibility of using micropatterning to tailor friction by manipulating contact area is investigated. Square wave patterns produced on samples from silicon wafers (and their unstructured equivalent) were slid against unstructured silicon counter surfaces. The width of the square wave features was adjusted to vary the apparent feature contact area. The existence of nanoscale roughness was sufficient to ensure Amontons’ first law (F = μP) on both structured & unstructured samples. Somewhat counterintuitively, friction was independent of the apparent feature contact area making it difficult to tailor friction via the feature contact area. This occurred because, even though the apparent feature contact area was adjusted, the surface roughness and nominal flatness at the contact interface was preserved ensuring that the real contact area and thereby the friction, were likewise preserved. This is an interesting special case, but not universally applicable: friction can indeed be adjusted by structuring provided the intervention leads to a change in real contact area (or interlocking)– and this depends on the specific surface geometry and topography.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Xu, Dr Yang and Hamilton, Mr Alexander and Bin Jaber, Mr Saad and Mulvihill, Dr Daniel and Gadegaard, Professor Nikolaj
Creator Roles:
Bin Jaber, S.Methodology, Software, Validation, Formal analysis, Visualization, Investigation
Hamilton, A.Methodology, Resources
Xu, Y.Conceptualization, Supervision, Writing – review and editing
Gadegaard, N.Supervision, Writing – review and editing
Mulvihill, D. M.Supervision, Conceptualization, Writing – original draft, Writing – review and editing, Project administration, Funding acquisition
Authors: Bin Jaber, S., Hamilton, A., Xu, Y., Kartal, M. E., Gadegaard, N., and Mulvihill, D. M.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Tribology International
Publisher:Elsevier
ISSN:0301-679X
ISSN (Online):1879-2464
Published Online:25 July 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Tribology International 153: 106563
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
302858Fundamental Mechanical Behaviour of Nano and Micro Structured InterfacesDaniel MulvihillLeverhulme Trust (LEVERHUL)RPG-2017-353ENG - Systems Power & Energy
172865EPSRC DTP 16/17 and 17/18Tania GalabovaEngineering and Physical Sciences Research Council (EPSRC)EP/N509668/1Research and Innovation Services