Naive model for stick-slip processes.
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 ( approximately 100 microm/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.
Brochard-Wyart
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F
Centre de Recherche, CNRS UMR 168 - Université Paris 6, Institut Curie, F-75231, Paris Cedex 05, France. francoise.brochard@curie.fr
de Gennes
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PG
D004735:Energy Transfer; D005898:Glass; D006860:Hydrogen Bonding; D008956:Models, Chemical; D015233:Models, Statistical; D008962:Models, Theoretical; D055585:Physical Phenomena; D010825:Physics; D011108:Polymers / Q000737:chemistry*; D012408:Rubber; D013499:Surface Properties; D000267:Tissue Adhesions