Rubber friction for tire tread compound on road surfaces

We have measured the surface topography and calculated the surface roughness power spectrum for an asphalt road surface. For the same surface we have measured the friction for a tire tread compound for velocities 10−6 m s−1 < v < 10−3 m s−1 at three different temperatures (at −8 °C, 20 °C and...

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Bibliographic Details
Published inJournal of physics. Condensed matter Vol. 25; no. 9; p. 095007
Main Authors Lorenz, B, Persson, B N J, Fortunato, G, Giustiniano, M, Baldoni, F
Format Journal Article
LanguageEnglish
Published England IOP Publishing 06.03.2013
Subjects
Condensed matter
Contact
Friction
Mathematical analysis
Roads
Rubber
Treads
Viscoelasticity
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Summary:We have measured the surface topography and calculated the surface roughness power spectrum for an asphalt road surface. For the same surface we have measured the friction for a tire tread compound for velocities 10−6 m s−1 < v < 10−3 m s−1 at three different temperatures (at −8 °C, 20 °C and 48 °C). The friction data was shifted using the bulk viscoelasticity shift factor aT to form a master curve. We have measured the effective rubber viscoelastic modulus at large strain and calculated the rubber friction coefficient (and contact area) during stationary sliding and compared it to the measured friction coefficient. We find that for the low velocities and for the relatively smooth road surface we consider, the contribution to friction from the area of real contact is very important, and we interpret this contribution as being due to shearing of a very thin confined rubber smear film.
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ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/25/9/095007