Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2001-11-20
Physics
Condensed Matter
Soft Condensed Matter
submitted to ASME: J. Appl. Mech
Scientific paper
This paper presents the stability analysis of a system sliding at low velocities ($< 100 \mu$m.s$^{-1}$) under a periodically modulated normal load, preserving interfacial contact. Experiments clearly evidence that normal vibrations generally stabilize the system against stick-slip oscillations, at least for a modulation frequency much larger than the stick-slip one. The mechanical model of Bureau {\it et al.} (2000), validated on the steady-state response of the system, is used to map its stability diagram. The model takes explicitly into account the finite shear stiffness of the load-bearing asperities, in addition to a classical state- and rate-dependent friction force. The numerical results are in excellent quantitative agreement with the experimental data obtained from a multicontact frictional system between glassy polymer materials. Simulations at larger amplitude of modulation (typically 20% of the mean normal load) suggest that the non-linear coupling between normal and sliding motion could have a destabilizing effect in restricted regions of the parameter space.
Baumberger Tristan
Bureau Lionel
Cochard Alain
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