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Soft Matter and Biological Physics


Eur. Phys. J. E 8, 331-337 (2002)
DOI: 10.1140/epje/i2002-10017-1

Rheological aging and rejuvenation in solid friction contacts

L. Bureau, T. Baumberger and C. Caroli

Groupe de Physique des Solides (UMR 7588), Universités Paris 6 & 7, 2 place Jussieu, 75251 Paris Cedex 05, France

bureau@gps.jussieu.fr

(Received 20 February 2002 and Received in final form 16 May 2002)

Abstract
We study the low-velocity (0.1-100 $\mu$m s -1) frictional properties of interfaces between a rough glassy polymer and smooth silanized glass, a configuration which gives direct access to the rheology of the adhesive joints in which shear localizes. We show that these joints exhibit the full phenomenology expected for confined quasi-2D soft glasses: they strengthen logarithmically when aging at rest, and weaken (rejuvenate) when sliding. Rejuvenation is found to saturate at large velocities. Moreover, aging at rest is shown to be strongly accelerated when waiting under finite stress below the static threshold.

PACS
61.20.Lc - Time-dependent properties; relaxation.
62.20.Fe - Deformation and plasticity (including yield, ductility, and superplasticity).
81.40.Pq - Friction, lubrication, and wear.


© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2002