EPJ Web of Conferences
Volume 6, 2010ICEM 14 – 14th International Conference on Experimental Mechanics
|Number of page(s)
|Thin Films and Coatings
|10 June 2010
MEMS-based contact stress ﬁeld measurements at a rough elastomeric layer: local test of Amontons’ friction law in static and steady sliding regimes
Laboratoire de Physique Statistique, CNRS/ENS/University Paris
6/University Paris 7, Paris, France
2 Physics of Geological Processes, University of Oslo, Oslo, Norway
3 Department of Mathematics, King’s College, London, United Kingdom
4 IJLRDA, CNRS/Université Paris 6, Paris, France
a e-mail: email@example.com
We present the results of recent friction experiments in which a MEMS-based sensing device is used to measure both the normal and tangential stress ﬁelds at the base of a rough elastomer ﬁlm in frictional contact with smooth, rigid, glass indentors. We consider successively multicontacts under (i) static normal loading by a spherical indentor and (ii) frictional steady sliding conditions against a cylindrical indentor, for an increasing normal load. In both cases, the measured ﬁelds are compared to elastic calculations assuming (i) a smooth interface and (ii) Amontons’ friction law. In the static case, signiﬁcant deviations are observed which decrease with increasing load and which vanish when a lubricant is used. In the steady sliding case, Amontons’ law reproduces rather satisfactorily the experiments provided that the normal/tangential coupling at the contact interface is taken into account. We discuss the origin of the diﬀerence between the Amontons ﬁelds and the measured ones, in particular the eﬀect of the ﬁnite normal and tangential compliances of the multicontact interface.
© Owned by the authors, published by EDP Sciences, 2010
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