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

Journal Article · · Journal of the Mechanics and Physics of Solids
 [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)

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.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344; AC02-06CH11357; 17-LW-009; 16-ERD-010
OSTI ID:
1569673
Alternate ID(s):
OSTI ID: 1509932
Report Number(s):
LLNL-JRNL-738588; 891771; TRN: US2001355
Journal Information:
Journal of the Mechanics and Physics of Solids, Vol. 112, Issue C; ISSN 0022-5096
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 48 works
Citation information provided by
Web of Science

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Cited By (3)

A rate‐dependent constitutive model for brittle granular materials based on breakage mechanics journal March 2019
In Situ X-ray Tomography and 3D X-ray Diffraction Measurements of Cemented Granular Materials journal September 2019
Micromechanical Response of Crystalline Phases in Alternate Cementitious Materials using 3-Dimensional X-ray Techniques journal December 2019

Figures / Tables (15)


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