Journal of Nonlinear Science

, Volume 22, Issue 5, pp 813–848

Periodic Travelling Waves and Compactons in Granular Chains

Article

DOI: 10.1007/s00332-012-9128-3

Cite this article as:
James, G. J Nonlinear Sci (2012) 22: 813. doi:10.1007/s00332-012-9128-3

Abstract

We study the propagation of an unusual type of periodic travelling waves in chains of identical beads interacting via Hertz’s contact forces. Each bead periodically undergoes a compression phase followed by free flight, due to special properties of Hertzian interactions (fully nonlinear under compression and vanishing in the absence of contact). We prove the existence of such waves close to binary oscillations, and numerically continue these solutions when their wavelength is increased. In the long wave limit, we observe their convergence towards shock profiles consisting of small compression regions close to solitary waves, alternating with large domains of free flight where bead velocities are small. We give formal arguments to justify this asymptotic behavior, using a matching technique and previous results concerning solitary wave solutions. The numerical finding of such waves implies the existence of compactons, i.e. compactly supported compression waves propagating at a constant velocity, depending on the amplitude and width of the wave. The beads are stationary and separated by equal gaps outside the wave, and each bead reached by the wave is shifted by a finite distance during a finite time interval. Below a critical wave number, we observe fast instabilities of the periodic travelling waves, leading to a disordered regime.

Keywords

Granular chain Hertzian contact Hamiltonian lattice Periodic travelling wave Compacton Fully nonlinear dispersion 

Mathematics Subject Classification

37K60 70F45 70K50 70K75 74J30 

Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Laboratoire Jean KuntzmannUniversité de Grenoble and CNRSGrenoble Cedex 9France

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