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Jamming creep of a frictional interface
L Bureau1, T Baumberger, C Caroli
1Groupe de Physique des Solides, Universités Paris 6 et 7, UMR CNRS 7588, 2 place Jussieu, 75251 Paris, Cedex 05, France.
Summary
This study reveals a jamming creep regime in polymer glasses under shear force. An aging-rejuvenation competition within contacting asperities governs this behavior, deviating from established models.
Area of Science:
- Tribology
- Polymer Physics
- Materials Science
Background:
- Frictional interfaces are crucial in many engineering applications.
- Understanding the complex dynamics of polymer glasses under shear is essential for predicting material behavior.
Purpose of the Study:
- To investigate the displacement response of a polymer glass interface under biased shear force oscillation.
- To identify and characterize novel creep regimes in multicontact frictional interfaces.
Main Methods:
- Experimental measurement of displacement response.
- Application of biased shear force oscillation to polymer glass interfaces.
- Analysis of creep dynamics and time dependence.
Main Results:
- Evidence of a jamming creep regime at forces near the static threshold.
- Observation of an aging-rejuvenation competition within micrometer-sized contacting asperities.
- Deviation from standard Rice-Ruina phenomenology at early times.
Conclusions:
- The jamming creep regime is governed by a scale-dependent aging-rejuvenation competition.
- The findings suggest aging-rejuvenation dynamics may occur at nanometer scales within adhesive junctions.
- This research offers new insights into the fundamental mechanisms of friction and creep in polymers.