In situ grain fracture mechanics during uniaxial compaction of granular solids
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Johns Hopkins Univ., Baltimore, MD (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- 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
Web of Science
A rate‐dependent constitutive model for brittle granular materials based on breakage mechanics
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journal | March 2019 |
In Situ X-ray Tomography and 3D X-ray Diffraction Measurements of Cemented Granular Materials
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journal | September 2019 |
Micromechanical Response of Crystalline Phases in Alternate Cementitious Materials using 3-Dimensional X-ray Techniques
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journal | December 2019 |
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