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Power-Laws in Nonlinear Granular Chain under Gravity

Jongbae Hong·Jeong-Young Ji·Heekyong Kim
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Abstract

The signal generated by a weak impulse propagates in an oscillatory way and dispersively in a gravitationally compacted granular chain. For the power-law type contact force, we show analytically that the type of dispersion follows power-laws in depth. The power-law for grain displacement signal is given by $h^{-1/4(1-1/p)}$ where $h$ and $p$ denote depth and the exponent of contact force, and the power-law for the grain velocity is $h^{-1/4({1/3}+1/p)}$. Other depth-dependent power-laws for oscillation frequency, wavelength, and period are given by combining above two and the phase velocity power-law $h^{1/2(1-1/p)}$. We verify above power-laws by comparing with the data obtained by numerical simulations.

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Jongbae Hong, Jeong-Young Ji, Heekyong Kim. 1999-02-19. Power-Laws in Nonlinear Granular Chain under Gravity. https://doi.org/10.1103/physrevlett.82.3058

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