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Related Experiment Videos

Dry friction avalanches: experiment and theory.

Sergey V Buldyrev1, John Ferrante, Fredy R Zypman

  • 1Department of Physics, Yeshiva University, 2495 Amsterdam Avenue, New York, New York 10033, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 7, 2007
PubMed
Summary

Dry friction stick-slip behavior aligns with self-organized criticality, evidenced by power-law force drops. A refined model incorporating tribometer dynamics explains experimental power spectra, linking friction fluctuations to surface geometry.

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Area of Science:

  • Physics
  • Tribology
  • Materials Science

Background:

  • Stick-slip phenomena in dry friction are complex, with potential links to self-organized criticality (SOC).
  • Previous models, like the Robin Hood model, offer insights but may not fully capture experimental dynamics.

Purpose of the Study:

  • To experimentally investigate dry friction stick-slip using a pin-on-disk tribometer.
  • To test the hypothesis that stick-slip motion is governed by self-organized criticality.
  • To develop and validate a theoretical model that accurately describes experimental friction dynamics.

Main Methods:

  • Collected lateral force data over time from aluminum and steel surfaces using a pin-on-disk tribometer.
  • Analyzed probability distributions of force drops and frequency power spectra.

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  • Compared experimental results with the Robin Hood SOC model and developed a new model by numerically solving equations of motion.

    • Main Results:

    • Experimental force drop distributions followed a negative power law (exponents 3.2-3.5).
    • Frequency power spectra exhibited a 1/f^alpha pattern (alpha 1-1.8).
    • Good agreement was found for force-drop distributions with the Robin Hood model, but discrepancies arose for power spectra, which were resolved by the new model.

    Conclusions:

    • Dry friction stick-slip exhibits characteristics of self-organized criticality.
    • A refined theoretical model, accounting for tribometer stiffness and inertia, accurately predicts experimental power spectra.
    • Friction force fluctuations are physically linked to the microscopic surface geometry.