https://doi.org/10.1140/epje/i2007-10215-3
Regular Article
Naive model for stick-slip processes
1
Centre de Recherche, CNRS UMR 168 - Université Paris 6, Institut Curie, F-75231, Paris Cedex 05, France
2
Institut Curie, 26 rue d'Ulm, F-75005, Paris, France
* e-mail: francoise.brochard@curie.fr
Received:
12
February
2007
Accepted:
2
August
2007
Published online:
7
September
2007
This paper is a tutorial description of stick-slip in soft materials (rubber beads, gels) where inertial effects are negligible. A typical example is a rubber sphere, pressed against a glass surface (JKR contact). The sphere is driven from the top at a prescribed velocity U (∼ 100 μm/s). At moderate U (and with suitable surface treatment) a periodic stick-slip regime is often observed. We present a simple picture of the stick-slip cycle, describing the growth of a slip zone from the rear end of the sample, and the resulting plot of force vs. time. All our estimates are restricted to scaling laws.
PACS: 62.20.Qp Tribology and hardness – / 68.08.Bc Wetting – / 82.35.Gh Polymers on surfaces; adhesion –
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2007