Crackling noise in paper peelingL. I. Salminen1, J. M. Pulakka1, J. Rosti1, M. J. Alava1, 2 and K. J. Niskanen3
1 Helsinki University of Technology, Laboratory of Physics P.O. Box 1100, FIN-02015 HUT, Finland
2 SMC-INFM, Dipartimento di Fisica, Università "La Sapienza" P.le A. Moro 2, 00185 Roma, Italy
3 Finnish Pulp and Paper Research Institute P.O. Box 51, FIN-02151 Espoo, Finland
received 18 March 2005; accepted in final form 3 November 2005
published online 30 November 2005
Acoustic emission or crackling noise is measured from an experiment on splitting or peeling of paper. The energy of the events follows a power law, with an exponent . The event intervals have a wide range, but superposed on scale-free statistics there is a time scale, related to the typical spatial scale of the microstructure (a bond between two fibers). Since the peeling takes place via steady-state crack propagation, correlations can be studied with ease and shown to exist in the series of acoustic events.
62.20.Mk - Fatigue, brittleness, fracture, and cracks.
05.40.-a - Fluctuation phenomena, random processes, noise, and Brownian motion.
81.40.Np - Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure.
© EDP Sciences 2005