Crackling noise in paper peeling

Abstract

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 β ∼ 1.8 ± 0.2. 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.

Line Creep in Paper Peeling

“…The experiment labeled as "tensile" is the same experiment but with constant speed [3]. The distributions for waiting time τ = t i+1 − t i and velocity are also similar for all three cases [10].…”

“…The acoustic emission data is processed into t i , E i -pairs, where a heuristic method is used to identify the event and its energy. The same method is used in References [3,4,10,11]. Figure 1 shows an example of the t i , E i timeseries for a single creep experiment.…”

“…growth phenomena, domain walls, polymer chains, imbibition or fluid invasion, liquids moving on a solid substrate [2] and fracture fronts. We have recently done a series of experiments on what amounts to paper peeling: a front propagates across the sheet plane as the two halves are separated from each other [3]. The front or line is characterized by a (long-range) elasticity that tries to keep it flat, while the locally varying fracture toughness creates a disordering force.…”

Line creep in paper peeling

“…In Figure 2 we show the apparatus [6]. The failure line can be located along the ridge, in the center of the the Y-shaped construction formed by the unpeeled part of the sheet (below) and the two parts separated by the advancing line.…”

“…The failure line can be located along the ridge, in the center of the the Y-shaped construction formed by the unpeeled part of the sheet (below) and the two parts separated by the advancing line. Diagnostics consist of an Omron Z4D-F04 laser distance sensor for the displacement, and a standard plate-like piezoelectric sensor [6].…”