Abstract
We discuss the origin and properties of the crackling sound emitted by a crumpled sheet of Mylar as it is strained. These sheets possess many qualitative features of a traditional disordered system, including frustration and discrete memory. The sound can be resolved into discrete clicks, which are emitted during rapid changes in the conformation of the sheet. Observed click energies range over six orders of magnitude. The measured energy autocorrelation function for the sound is consistent with a stretched exponential, C(t)=A<th>exp[−Bt0.35]. The probability distribution of click energies has a power law regime, p(E)∼1/E, independent of sheet size and material. We also discuss future directions for this research.
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