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Naive model for stick-slip processes.

F Brochard-Wyart¹, P-G de Gennes

¹Centre de Recherche, CNRS UMR 168 - Université Paris 6, Institut Curie, F-75231, Paris Cedex 05, France. francoise.brochard@curie.fr

The European Physical Journal. E, Soft Matter

|September 8, 2007

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This study explains the stick-slip phenomenon in soft materials like gels and rubber. It details how a slip zone grows, causing periodic motion and force variations, using simple scaling laws.

Area of Science:

Soft Matter Physics
Tribology
Material Science

Background:

Stick-slip motion is a common phenomenon in soft materials.
Inertial effects are often negligible in these systems.
Examples include rubber spheres on glass (JKR contact).

Purpose of the Study:

To provide a tutorial description of stick-slip in soft materials.
To explain the underlying mechanics of the stick-slip cycle.
To present scaling laws for estimating parameters.

Main Methods:

Analysis of stick-slip in soft materials (e.g., rubber beads, gels).
Focus on systems where inertial effects are negligible.
Utilizing a simple model of slip zone growth.

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Main Results:

Observed periodic stick-slip regime at moderate velocities (approx. 100 microm/s).
Described the growth of a slip zone from the rear of the sample.
Presented force vs. time plots characteristic of the cycle.

Conclusions:

A simple model effectively describes the stick-slip cycle in soft materials.
Scaling laws provide useful estimates for system behavior.
Understanding this phenomenon is crucial for applications involving soft material interfaces.