Rolling and sliding: Separation of adhesion and deformation friction and their relative contribution to total friction |
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| Affiliation: | 1. National Centre for Advanced Tribology at Southampton (nCATS), Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK;2. Bioengineering Science Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK;3. Institute of Fundamental Technological Research, Polish Academy of Sciences (IPPT PAN), ul. Pawinskiego 5B, 02-106 Warsaw, Poland;4. Biomedical Imaging Unit, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YDJ, UK;5. Computational Engineering and Design Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK;6. Laboratory of Biomechanics and Mechanobiology, Division of Biomedical Engineering, Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Observatory 7935, South Africa |
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| Abstract: | This study is concerned with determining the relative contribution of adhesion and deformation friction using rolling and sliding method. The challenges associated with in-vivo friction testing were overcome by utilising a novel substrate that mimics the viscoelastic behaviour and surface texture of human skin combined with a repeatable and reproducible test setup. The results show that in the dry state, deformation friction contributes 20% of the total friction while the remaining proportion is due to adhesion. These proportions are affected by probe material where for PTFE, deformation friction contributes 30% of the total friction. For the lubricated state, the contribution of deformation friction to total friction increases approaching 50–50% at the higher sliding speeds and normal loads investigated. |
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| Keywords: | Friction sliding Friction rolling Deformation Adhesion |
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