DEM Particle Fracture Model

Technical Report · Tue Dec 01 00:00:00 EST 2015

DOI:https://doi.org/10.2172/1235391· OSTI ID:1235391

Zhang, Boning ^[1]; Herbold, Eric B. ^[2]; Homel, Michael A. ^[2]; Regueiro, Richard A. ^[1]

---

1. Univ. of Colorado, Boulder, CO (United States)
2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

An adaptive particle fracture model in poly-ellipsoidal Discrete Element Method is developed. The poly-ellipsoidal particle will break into several sub-poly-ellipsoids by Hoek-Brown fracture criterion based on continuum stress and the maximum tensile stress in contacts. Also Weibull theory is introduced to consider the statistics and size effects on particle strength. Finally, high strain-rate split Hopkinson pressure bar experiment of silica sand is simulated using this newly developed model. Comparisons with experiments show that our particle fracture model can capture the mechanical behavior of this experiment very well, both in stress-strain response and particle size redistribution. The effects of density and packings o the samples are also studied in numerical examples.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC52-07NA27344
• OSTI ID: 1235391
• Report Number(s): LLNL-TR-679839
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
58 GEOSCIENCES
97 MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
Discrete Element Method
particle fracture model
high strain rate
split Hopkinson pressure bar experiments
Hoek-Brown fracture criterion
maximum tensile stress in contacts
packing e ects