Journal
LUBRICANTS
Volume 7, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/lubricants7100085
Keywords
rubber friction; viscoelasticity; roughness
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Funding
- DFG (German Research Foundation) [PA 3303/1-1]
- PON Ricerca e Innovazione 2014/2020-Azione I.2-D.D [407]
- Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence [L.232/2016]
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Since the early study by Grosch in 1963 it has been known that rubber friction shows generally two maxima with respect to speed-the first one attributed to adhesion, and another at higher velocities attributed to viscoelastic losses. The theory of Kluppel and Heinrich and that of Persson suggests that viscoelastic losses crucially depend on the multiscale aspect of roughness and in particular on truncation at fine scales. In this study, we comment a little on both theories, giving some examples using Persson's theory on the uncertainties involved in the truncation of the roughness spectrum. It is shown how different choices of Persson's model parameters, for example the high-frequency cutoff, equally fit experimental data on viscoelastic friction, hence it is unclear how to rigorously separate the adhesive and the viscoelastic contributions from experiments.
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