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Temporal properties of acoustic emission in paper peeling
Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)
Аннотация
We present statistical analysis of acoustic emission from
tensile and creep failure experiments on paper sheets.
In particular, we study a 'peep-in-nip' (PIN) geometry in which sheets of
paper are split into two halves. Intermittent properties
of acoustic emission in tensile and creep experiments are compared.
In constant strain-rate experiments peeling takes place via, on the average, steady-state crack line propagation,
whereas creep exhibits stick-slip dynamics. The energy of the events follows a power-law distribution with same exponent in both cases, but temporal properties are different. The recurrence time distribution for creep experiments has a scaling form $P(T) T^-\alpha$, but tensile experiments exhibit on the top of the power-law scaling
a typical time-scale. We discuss the applicability of universal scaling form of the recurrence time distribution in paper, similar as found from rock fracture and earthquakes.
The acoustic emission events are found to be temporally clustered in both cases, but with a different structure. Creep experiments show evidence of dominant foreshock clusters. We discuss the similarity of the temporal structure of acoustic emission on Volcano Tectonic (VT) seismicity and peeling experiments on paper, and comment on the implications for the theory of line creep and depinning in random media.
1) L.I. Salminen et al., Crackling noise in paper peeling, Europhys. Lett. 73, 55 (2006).\\
2) J. Koivisto et al., Creep of a fracture line in paper peeling, cond-mat/0701562 (2007).
