Dynamic induced softening in frictional granular materials investigated by discrete-element-method simulation
Abstract
A granular system composed of frictional glass beads is simulated here using the discrete element method. The intergrain forces are based on the Hertz contact law in the normal direction with frictional tangential force. The damping due to collision is also accounted for. Systems are loaded at various stresses and their quasistatic elastic moduli are characterized. Each system is subjected to an extensive dynamic testing protocol by measuring the resonant response to a broad range of ac drive amplitudes and frequencies via a set of diagnostic strains. The system, linear at small ac drive amplitudes, has resonance frequencies that shift downward (i.e., modulus softening) with increased ac drive amplitude. Detailed testing shows that the slipping contact ratio does not contribute significantly to this dynamic modulus softening, but the coordination number is strongly correlated to this reduction. This suggests that the softening arises from the extended structural change via break and remake of contacts during the rearrangement of bead positions driven by the ac amplitude.
- Authors:
-
- Swiss Federal Inst. of Technology in Zurich (ETH Zurich) (Switzerland). Chair of Building Physics; Swiss Federal Lab. for Materials Science and Technology (Empa), Dübendorf (Switzerland). Lab. of Multiscale Studies in Building Physics
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Nevada, Reno, NV (United States). Dept. of Physics
- Inst. Langevin, Paris (France)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1514965
- Alternate Identifier(s):
- OSTI ID: 1410868
- Report Number(s):
- LA-UR-17-27305
Journal ID: ISSN 2470-0045
- Grant/Contract Number:
- 89233218CNA000001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review E
- Additional Journal Information:
- Journal Volume: 96; Journal Issue: 6; Journal ID: ISSN 2470-0045
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; granular packing; dry granular materials; granular materials; hydrodynamic waves
Citation Formats
Lemrich, Laure, Carmeliet, Jan, Johnson, Paul A., Guyer, Robert, and Jia, Xiaoping. Dynamic induced softening in frictional granular materials investigated by discrete-element-method simulation. United States: N. p., 2017.
Web. doi:10.1103/PhysRevE.96.062901.
Lemrich, Laure, Carmeliet, Jan, Johnson, Paul A., Guyer, Robert, & Jia, Xiaoping. Dynamic induced softening in frictional granular materials investigated by discrete-element-method simulation. United States. doi:10.1103/PhysRevE.96.062901.
Lemrich, Laure, Carmeliet, Jan, Johnson, Paul A., Guyer, Robert, and Jia, Xiaoping. Fri .
"Dynamic induced softening in frictional granular materials investigated by discrete-element-method simulation". United States. doi:10.1103/PhysRevE.96.062901. https://www.osti.gov/servlets/purl/1514965.
@article{osti_1514965,
title = {Dynamic induced softening in frictional granular materials investigated by discrete-element-method simulation},
author = {Lemrich, Laure and Carmeliet, Jan and Johnson, Paul A. and Guyer, Robert and Jia, Xiaoping},
abstractNote = {A granular system composed of frictional glass beads is simulated here using the discrete element method. The intergrain forces are based on the Hertz contact law in the normal direction with frictional tangential force. The damping due to collision is also accounted for. Systems are loaded at various stresses and their quasistatic elastic moduli are characterized. Each system is subjected to an extensive dynamic testing protocol by measuring the resonant response to a broad range of ac drive amplitudes and frequencies via a set of diagnostic strains. The system, linear at small ac drive amplitudes, has resonance frequencies that shift downward (i.e., modulus softening) with increased ac drive amplitude. Detailed testing shows that the slipping contact ratio does not contribute significantly to this dynamic modulus softening, but the coordination number is strongly correlated to this reduction. This suggests that the softening arises from the extended structural change via break and remake of contacts during the rearrangement of bead positions driven by the ac amplitude.},
doi = {10.1103/PhysRevE.96.062901},
journal = {Physical Review E},
number = 6,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}
Web of Science
Figures / Tables:

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