COMPLEX DYNAMIC BEHAVIOR IN ADHESIVE TAPE PEELING

In this work we analyze dynamic features of the peeling of an adhesive tape from the roll. Two sets of experiments were carried out. In the first, we have measured the unwinding force of an adhesive tape at sev eral constant peel velocities. Analysis of the force-time series, usin g the Lyapunov exponent and Grassberger-Procaccia dimension, showed th at the force oscillations were deterministic. In the second set of exp eriments, the acoustic emission generated by unwinding at constant pee l force was studied. Power spectra analysis of the acoustic emission-t ime series revealed the existence of two frequency domains: lower freq uencies are associated with stick-slip and higher frequencies are rela ted to the massive rupture of adhesive fibrils. The values of the Gras sberger-Procaccia dimension for the two sets of experiments were simil ar, and also comparable to the value reported by Scudiero er al., usin g electrical current-time series obtained while peeling an adhesive ta pe from a copper substrate. This agreement indicates that the same dis sipation mechanisms are operative in the present case and in the case reported previously by these authors.