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Dissipative Solitary Waves in Granular Crystals

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arxiv 0812.0662 v1 pith:QWPHECFS submitted 2008-12-03 nlin.PS

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keywords dissipativecrystalseffectsgranularsolitarywavesallowbrass
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We provide a quantitative characterization of dissipative effects in one-dimensional granular crystals. We use the propagation of highly nonlinear solitary waves as a diagnostic tool and develop optimization schemes that allow one to compute the relevant exponents and prefactors of the dissipative terms in the equations of motion. We thereby propose a quantitatively-accurate extension of the Hertzian model that encompasses dissipative effects via a discrete Laplacian of the velocities. Experiments and computations with steel, brass, and polytetrafluoroethylene reveal a {\em common} dissipation exponent with a material-dependent prefactor.

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