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Title: Meso-scale framework for modeling granular material using computed tomography

Abstract

Numerical modeling of unconsolidated granular materials is comprised of multiple nonlinear phenomena. Accurately capturing these phenomena, including grain deformation and intergranular forces depends on resolving contact regions several orders of magnitude smaller than the grain size. Here, we investigate a method for capturing the morphology of the individual particles using computed X-ray and neutron tomography, which allows for accurate characterization of the interaction between grains. The ability of these numerical approaches to determine stress concentrations at grain contacts is important in order to capture catastrophic splitting of individual grains, which has been shown to play a key role in the plastic behavior of the granular material on the continuum level. Discretization approaches, including mesh refinement and finite element type selection are presented to capture high stress concentrations at contact points between grains. The effect of a grain’s coordination number on the stress concentrations is also investigated.

Authors:
ORCiD logo [1];  [1];  [1];  [2]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1349010
Report Number(s):
LLNL-JRNL-726885
Journal ID: ISSN 0266-352X
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Computers and Geotechnics
Additional Journal Information:
Journal Volume: 76; Journal ID: ISSN 0266-352X
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 58 GEOSCIENCES; 97 MATHEMATICS AND COMPUTING; Granular Material; Finite Element Model; Meso-Scale Model; Computed Tomography; Contact Forces

Citation Formats

Turner, Anne K., Kim, Felix H., Penumadu, Dayakar, and Herbold, Eric B. Meso-scale framework for modeling granular material using computed tomography. United States: N. p., 2016. Web. doi:10.1016/j.compgeo.2016.02.019.
Turner, Anne K., Kim, Felix H., Penumadu, Dayakar, & Herbold, Eric B. Meso-scale framework for modeling granular material using computed tomography. United States. https://doi.org/10.1016/j.compgeo.2016.02.019
Turner, Anne K., Kim, Felix H., Penumadu, Dayakar, and Herbold, Eric B. Thu . "Meso-scale framework for modeling granular material using computed tomography". United States. https://doi.org/10.1016/j.compgeo.2016.02.019. https://www.osti.gov/servlets/purl/1349010.
@article{osti_1349010,
title = {Meso-scale framework for modeling granular material using computed tomography},
author = {Turner, Anne K. and Kim, Felix H. and Penumadu, Dayakar and Herbold, Eric B.},
abstractNote = {Numerical modeling of unconsolidated granular materials is comprised of multiple nonlinear phenomena. Accurately capturing these phenomena, including grain deformation and intergranular forces depends on resolving contact regions several orders of magnitude smaller than the grain size. Here, we investigate a method for capturing the morphology of the individual particles using computed X-ray and neutron tomography, which allows for accurate characterization of the interaction between grains. The ability of these numerical approaches to determine stress concentrations at grain contacts is important in order to capture catastrophic splitting of individual grains, which has been shown to play a key role in the plastic behavior of the granular material on the continuum level. Discretization approaches, including mesh refinement and finite element type selection are presented to capture high stress concentrations at contact points between grains. The effect of a grain’s coordination number on the stress concentrations is also investigated.},
doi = {10.1016/j.compgeo.2016.02.019},
journal = {Computers and Geotechnics},
number = ,
volume = 76,
place = {United States},
year = {Thu Mar 17 00:00:00 EDT 2016},
month = {Thu Mar 17 00:00:00 EDT 2016}
}

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