This paper deals with the characterization of occurrence of instabilities during the sliding of a deformable body on a rigid obstacle. We focus here on the analysis of the mechanical phenomenon which leads to local microshocks that could induce noise by exciting some eigenmodes of the structure. A model with constant friction coefficient is presented to characterize the occurrence of instabilities related to friction during a quasi-static sliding by using various instability criteria : energetic (power rate) criterion, dynamic divergence instability, dynamic flutter instability. Models and numerical processes are given. A first example concerns the characterization of stress waves and friction force jumps for a photoelastic solid sliding on a plane. A second exemple is related to the noise generation during the sliding of a rubber licker on a car window. The model is applied to an experiment conducted so as to characterize the friction coefficient of the material and where instabilities have been observed in some cases.

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