Abstract Submitted for the Mar96 Meeting of the Americal Physical
Power-law scaling in the sound of paper crumpling
PAUL A. HOULE, JAMES P. SETHNA., LASSP, Cornell University
-- From the crust of the Earth under the mechanical stress of tectonic
motion to martensites under thermal stress, many systems emit pulsed
acoustic energy with a power law probability distribution over energy.
We have found that a system that fits comfortably in one's hands,
a sheet of paper being crumpled, is a member of this fraternity. Crumpling
paper both in hand and using a novel cylindrical geometry we found a
power law distribution spanning at least two decades in energy.
(p(E)=Ea, a=1.3-1.6) Crupling frsh sheets, previously
crumpled sheets, and sheets with regular crease grids we found little or
no systematic dependence of the pulse energy distribution over time,
the size of the sheet, or on the spacing of the grid. It is known that
the sound pulses are caused by the buckling of regions of the paper
sheet, but we suspect that the energy of the acoustic pulses depend
weakly on the size of the regions producing them.
Date submitted: November 30, 1995
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honeylocust media systems,