Title: Quantifying the hierarchy of structural and mechanical length scales in granular systems

Journal Article · · Extreme Mechanics Letters
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Johns Hopkins Univ., Baltimore, MD (United States). Hopkins Extreme Materials Inst.
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Lund Univ. (Sweden); Lund Univ. (Sweden). Lund Inst. of Advanced Neutron and X-ray Science
  4. Johns Hopkins Univ., Baltimore, MD (United States). Hopkins Extreme Materials Inst.; Johns Hopkins Univ., Baltimore, MD (United States)

Continuum modeling of granular media is made possible by the existence of a length scale at and above which grain-resolved properties can be meaningfully homogenized. Progress has been made in identifying such length scales relevant to local structural properties such as porosity. However, a systematic analysis of scales above which different mechanical properties can be homogenized has yet to emerge. Here, X-ray tomography and 3D X-ray diffraction data are examined to identify such length scales. The data was obtained in-situ in compressed granular materials with rigid and flexible confinement. The experimental data are supplemented with validated discrete element simulations which examine different system sizes and different boundary conditions. Overall, our study reveals a hierarchy in the length scales of granular solids, with lengths governing structural variables being the shortest, lengths of stress variables being intermediate, and lengths of energy dissipation being the longest. All structural and mechanical length scales obey a power law based on the theory of Geostatistics, implying that the length scales can be found by analyzing samples significantly smaller than the length scales themselves. The length scales are also found to be sensitive to boundary conditions, implying that they are extrinsic features of granular media.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1874114
Report Number(s):
LLNL-JRNL-836386; 1055783
Journal Information:
Extreme Mechanics Letters, Journal Name: Extreme Mechanics Letters Journal Issue: N/A Vol. 51; ISSN 2352-4316
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (72)

On the role of fluids in stick-slip dynamics of saturated granular fault gouge using a coupled computational fluid dynamics-discrete element approach: STICK-SLIP IN SATURATED FAULT GOUGE journal May 2017
Homogenization and two-scale simulations of granular materials for different microstructural constraints journal August 2010
A coupled FEM/DEM approach for hierarchical multiscale modelling of granular media: HIERARCHICAL MULTISCALE MODELLING OF GRANULAR MEDIA journal June 2014
A study of the influence of REV variability in double-scale FEM ×DEM analysis: A study of the influence of REV variability in double-scale FEM ×DEM analysis
  • Shahin, Ghassan; Desrues, Jacques; Pont, Stefano Dal
  • International Journal for Numerical Methods in Engineering, Vol. 107, Issue 10 https://doi.org/10.1002/nme.5202
journal February 2016
Propagation of nonlinear compression pulses in granular media journal January 1984
Quantification of stochastically stable representative volumes for random heterogeneous materials journal December 2005
An approach to micro-macro modeling of heterogeneous materials journal January 2001
Stress, stress asymmetry and couple stress: from discrete particles to continuous fields journal March 2010
A characteristic length scale in confined elastic buckling of a force chain journal February 2011
Pore-scale analyses of heterogeneity and representative elementary volume for unconventional shale rocks using statistical tools journal August 2017
Elastic properties of reinforced solids: Some theoretical principles journal September 1963
A micromechanics-based nonlocal constitutive equation and estimates of representative volume element size for elastic composites journal April 1996
Two scale analysis of heterogeneous elastic-plastic materials with asymptotic homogenization and Voronoi cell finite element model journal May 1996
Determination of the size of the representative volume element for random composites: statistical and numerical approach journal June 2003
A multilevel finite element method (FE2) to describe the response of highly non-linear structures using generalized continua journal July 2003
Damage initiation under transverse loading of unidirectional composites with arbitrarily distributed fibers journal April 1999
FE investigation of the effect of particle distribution on the uniaxial stress–strain behaviour of particulate reinforced metal-matrix composites journal August 2001
Representative volumes of materials based on microstructural statistics journal February 2003
Determination of the critical size of a statistical representative volume element (SRVE) for carbon reinforced polymers☆ journal August 2006
Multi-scale computational homogenization: Trends and challenges journal August 2010
Numerical determination of representative volumes for granular materials journal July 2004
Apparent and effective physical properties of heterogeneous materials: Representativity of samples of two materials from food industry journal July 2006
Computational homogenization based on a weak format of micro-periodicity for RVE-problems journal January 2011
Data-Driven nonlocal mechanics: Discovering the internal length scales of materials journal December 2021
Homogenization of granular material modeled by a three-dimensional discrete element method journal May 2008
Numerical and statistical analysis of elastic modulus of concrete as a three-phase heterogeneous composite journal July 2014
Representative volume: Existence and size determination journal November 2007
Determination of the size of the Representative Volume Element (RVE) for the simulation of heterogeneous polymers at finite strains journal October 2016
Micromechanics of granular materials with capillary effects journal January 2009
Homogeneity and representativeness analyses of solid oxide fuel cell cathode microstructures journal December 2017
Contact rolling and deformation in granular media journal October 2004
Static and dynamic compaction of ceramic powders journal January 2007
Determination of the size of the representative volume element for random quasi-brittle composites journal July 2009
Representative volume element size determination for viscoplastic properties in polycrystalline materials journal February 2019
Simulating spatial heterogeneity through a CT-FE mapping scheme discloses boundary effects on emerging compaction bands journal September 2020
Shear band in sand with spatially varying density journal January 2013
Particle rotations and energy dissipation during mechanical compression of granular materials journal August 2019
Determining the representative volume element size for three-dimensional microstructural material characterization. Part 1: Predictive models journal May 2015
Kinematic and static assumptions for homogenization in micromechanics of granular materials journal December 2004
Representative elementary volume analysis of polydisperse granular packings using discrete element method journal August 2016
Evaluation of representative elementary volume for a vuggy carbonate rock—Part: Porosity, permeability, and dispersivity journal December 2013
Representative elementary volume analysis of porous media using X-ray computed tomography journal June 2010
Representative elementary volume estimation for porosity, moisture saturation, and air-water interfacial areas in unsaturated porous media: Data quality implications: REV ESTIMATION journal July 2011
On Representative Elementary Volumes of Grayscale Micro‐CT Images of Porous Media journal August 2020
Size Polydispersity Tunes Slip Avalanches of Granular Gouge journal December 2020
Stereology of single objects journal May 1997
Evaluation of Two Homogenization Techniques for Modeling the Elastic Behavior of Granular Materials journal November 2005
Patterned Nonaffine Motion in Granular Media journal October 2013
On the size of representative volume element for Darcy law in random media journal April 2006
Shock wave structure in a strongly nonlinear lattice with viscous dissipation journal February 2007
Representative elementary volume assessment of three-dimensional x-ray microtomography images of heterogeneous materials: Application to limestones journal May 2014
Nonlocal Constitutive Relation for Steady Granular Flow journal April 2012
Quantifying Interparticle Forces and Heterogeneity in 3D Granular Materials journal August 2016
Energy Fluctuations in Slowly Sheared Granular Materials journal December 2018
Force Distributions in Dense Two-Dimensional Granular Systems journal July 1996
Turbulentlike Fluctuations in Quasistatic Flow of Granular Media journal July 2002
Determining grain resolved stresses in polycrystalline materials using three-dimensional X-ray diffraction journal April 2010
Assessment of Texture Stationarity Using the Asymptotic Behavior of the Empirical Mean and Variance journal September 2008
Index for spatial heterogeneity in breast cancer journal November 2004
Ergodicity and integral range journal March 1991
On dense granular flows journal August 2004
Multiscale Continuous and Discontinuous Modeling of Heterogeneous Materials: a Review on Recent Developments journal December 2011
Flows of Dense Granular Media journal January 2008
Breast Carcinoma, Intratumour Heterogeneity and Histological Grading, Using Geostatistics journal January 2000
Three-dimensional sampling of material structure for property modeling and design journal June 2014
Models, algorithms and validation for opensource DEM and CFD-DEM journal January 2012
Representative Elementary Volume Analysis of Sands Using X-Ray Computed Tomography journal January 2007
Multiscale ‘tomography-to-simulation’ framework for granular matter: the road ahead journal September 2012
X-ray microtomography characterisation of the changes in statistical homogeneity of an unsaturated sand during imbibition journal May 2013
Void ratio evolution inside shear bands in triaxial sand specimens studied by computed tomography journal September 1996
Discrete and continuum analysis of localised deformation in sand using X-ray μCT and volumetric digital image correlation journal May 2010
Assessment of statistical homogeneity in chemically treated granular materials journal March 2018