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Title: Traveling waves in 2D hexagonal granular crystal lattices

Journal Article · · Granular Matter
 [1];  [2];  [2];  [3]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States). Dept. of Civil and Mechanical Engineering
  2. Univ. of Massachusetts, Amherst, MA (United States). Dept. of Mathematics and Statistics
  3. California Institute of Technology (CalTech), Pasadena, CA (United States). Dept. of Aerospace Engineering (GALCIT)

This study describes the dynamic response of a two-dimensional hexagonal packing of uncompressed stainless steel spheres excited by localized impulsive loadings. The dynamics of the system are modeled using the Hertzian normal contact law. After the initial impact strikes the system, a characteristic wave structure emerges and continuously decays as it propagates through the lattice. Using an extension of the binary collision approximation for onedimensional chains, we predict its decay rate, which compares well with numerical simulations and experimental data. While the hexagonal lattice does not support constant speed traveling waves, we provide scaling relations that characterize the directional power law decay of the wave velocity for various angles of impact. Lastly, we discuss the effects of weak disorder on the directional amplitude decay rates.

Research Organization:
Oak Ridge Associated Univ., Oak Ridge, TN (United States); California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-06OR23100
OSTI ID:
1816270
Journal Information:
Granular Matter, Vol. 16, Issue 4; ISSN 1434-5021
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Two interactional solitary waves propagating in two-dimensional hexagonal packing granular system journal July 2018
Wave propagation and pattern formation in two-dimensional hexagonally-packed granular crystals under various configurations journal November 2018
Pulse transmission and acoustic non-reciprocity in a granular channel with symmetry-breaking clearances journal December 2019
Stress Wave Propagation in Two-dimensional Buckyball Lattice journal November 2016
Conical wave propagation and diffraction in two-dimensional hexagonally packed granular lattices journal January 2016
From Modal Mixing to Tunable Functional Switches in Nonlinear Phononic Crystals journal February 2015
Focusing and Mode Separation of Elastic Vector Solitons in a 2D Soft Mechanical Metamaterial journal July 2019
Focusing and Mode Separation of Elastic Vector Solitons in a 2D Soft Mechanical Metamaterial text January 2020
Nonlinear Coherent Structures in Granular Crystals text January 2016
Guided Impact Mitigation in 2D and 3D Granular Crystals text January 2015

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