Féderation de recherche Fabri de Peiresc

Inertial effects on the multi-scale stick-slip dynamics in adhesive tape peeling

Orateur : Stéphane Santucci, ENS de Lyon

Abstract : Everyone has experienced the unpleasant screechy sound when peeling-off packing tape. This noise is the signature of a dynamical stick-slip instability, with periodic velocity oscillations of the peel front. Despite a large number of studies, such instability still causes industrial problems, bringing forward challenging questions. Recent studies have demonstrated that the unstable front dynamics is even a more complex process, involving a secondary instability at much smaller spatio-temporal scales than the macroscopic stick-slip.

Thanks to an extensive experimental study, we have been able to unveil the precise characteristics of this peel front micro-instability. In particular, the amplitude of this instability scales with its period as A T^1/3, with a pre-factor evolving slightly with the peel angle, and increasing systematically with the bending modulus of the tape backing. A local energy balance of the detachment process shows that the elastic bending energy stored in the tape region that will detach during the micro-slip is converted into a kinetic energy increase of the peeled tape during a micro-stick-slip cycle.

Our model allows a quantitative description of the observed scaling-law linking amplitudes and periods of the micro-instability, and in particular its dependency with the peeling angle, as well as with the bending modulus and lineic mass of the ribbon.

Date et lieu : le vendredi 14 février à 11h00, salle de séminaires IRPHE