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Title: In situ grain fracture mechanics during uniaxial compaction of granular solids

Abstract

Grain fracture and crushing are known to influence the macroscopic mechanical behavior of granular materials and be influenced by factors such as grain composition, morphology, and microstructure. In this paper, we investigate grain fracture and crushing by combining synchrotron x-ray computed tomography and three-dimensional x-ray diffraction to study two granular samples undergoing uniaxial compaction. Our measurements provide details of grain kinematics, contacts, average intra-granular stresses, inter-particle forces, and intra-grain crystal and fracture plane orientations. Our analyses elucidate the complex nature of fracture and crushing, showing that: (1) the average stress states of grains prior to fracture vary widely in their relation to global and local trends; (2) fractured grains experience inter-particle forces and stored energies that are statistically higher than intact grains prior to fracture; (3) fracture plane orientations are primarily controlled by average intra-granular stress and contact fabric rather than the orientation of the crystal lattice; (4) the creation of new surfaces during fracture accounts for a very small portion of the energy dissipated during compaction; (5) mixing brittle and ductile grain materials alters the grain-scale fracture response. The results highlight an application of combined x-ray measurements for non-destructive in situ analysis of granular solids and provide details aboutmore » grain fracture that have important implications for theory and modeling.« less

Authors:
 [1];  [2];  [3];  [2];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Johns Hopkins Univ., Baltimore, MD (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Cornell High Energy Synchrotron Source, Ithaca, NY (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1569673
Alternate Identifier(s):
OSTI ID: 1509932
Report Number(s):
LLNL-JRNL-738588
Journal ID: ISSN 0022-5096; 891771
Grant/Contract Number:  
AC52-07NA27344; AC02-06CH11357; 17-LW-009; 16-ERD-010
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Mechanics and Physics of Solids
Additional Journal Information:
Journal Volume: 112; Journal Issue: C; Journal ID: ISSN 0022-5096
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Hurley, R. C., Lind, J., Pagan, D. C., Akin, M. C., and Herbold, E. B. In situ grain fracture mechanics during uniaxial compaction of granular solids. United States: N. p., 2018. Web. doi:10.1016/j.jmps.2017.12.007.
Hurley, R. C., Lind, J., Pagan, D. C., Akin, M. C., & Herbold, E. B. In situ grain fracture mechanics during uniaxial compaction of granular solids. United States. doi:10.1016/j.jmps.2017.12.007.
Hurley, R. C., Lind, J., Pagan, D. C., Akin, M. C., and Herbold, E. B. Thu . "In situ grain fracture mechanics during uniaxial compaction of granular solids". United States. doi:10.1016/j.jmps.2017.12.007. https://www.osti.gov/servlets/purl/1569673.
@article{osti_1569673,
title = {In situ grain fracture mechanics during uniaxial compaction of granular solids},
author = {Hurley, R. C. and Lind, J. and Pagan, D. C. and Akin, M. C. and Herbold, E. B.},
abstractNote = {Grain fracture and crushing are known to influence the macroscopic mechanical behavior of granular materials and be influenced by factors such as grain composition, morphology, and microstructure. In this paper, we investigate grain fracture and crushing by combining synchrotron x-ray computed tomography and three-dimensional x-ray diffraction to study two granular samples undergoing uniaxial compaction. Our measurements provide details of grain kinematics, contacts, average intra-granular stresses, inter-particle forces, and intra-grain crystal and fracture plane orientations. Our analyses elucidate the complex nature of fracture and crushing, showing that: (1) the average stress states of grains prior to fracture vary widely in their relation to global and local trends; (2) fractured grains experience inter-particle forces and stored energies that are statistically higher than intact grains prior to fracture; (3) fracture plane orientations are primarily controlled by average intra-granular stress and contact fabric rather than the orientation of the crystal lattice; (4) the creation of new surfaces during fracture accounts for a very small portion of the energy dissipated during compaction; (5) mixing brittle and ductile grain materials alters the grain-scale fracture response. The results highlight an application of combined x-ray measurements for non-destructive in situ analysis of granular solids and provide details about grain fracture that have important implications for theory and modeling.},
doi = {10.1016/j.jmps.2017.12.007},
journal = {Journal of the Mechanics and Physics of Solids},
number = C,
volume = 112,
place = {United States},
year = {2018},
month = {3}
}

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