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  • Letter
  • Open Access

From force chains to nonclassical nonlinear dynamics in cemented granular materials

T. J. Ulrich*

Zhou Lei, Marcel C. Remillieux, Esteban Rougier, and Harvey E. Goodman

Katelyn A. Huffman

Peter Connolly

  • Detonation Science and Technology (Q-6), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

  • Geophysics Group (EES-17), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

  • Chevron Energy Technology Company, Houston, Texas 77002-7327, USA

  • ConnollyGeo, Houston, Texas 77019-4334, USA

  • *Correspondence author: tju@lanl.gov
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Phys. Rev. E 105, L022901 – Published 10 February, 2022

DOI: https://doi.org/10.1103/PhysRevE.105.L022901

Abstract

In this letter, we present evidence for a mechanism responsible for the nonclassical nonlinear dynamics observed in many cemented granular materials that are generally classified as mesoscopic nonlinear elastic materials. We demonstrate numerically that force chains are created within the complex grain-pore network of these materials when subjected to dynamic loading. The interface properties between grains along with the sharp and localized increase of the stress occurring at the grain-grain contacts leads to a reversible decrease of the elastic properties at macroscopic scale and peculiar effects on the propagation of elastic waves when grain boundary properties are appropriately considered. These effects are observed for relatively small amplitudes of the elastic waves, i.e., within tens of microstrain, and relatively large wavelengths, i.e., orders of magnitude larger than the material constituents. The mechanics are investigated numerically using the hybrid finite-discrete-element method and match those observed experimentally using nonlinear resonant ultrasound spectroscopy.

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Phys. Rev. E 105, L022901– Published 10 February, 2022
  • Received 2 November 2021
  • Accepted 18 January 2022
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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