DEM Particle Fracture Model

Zhang, Boning¹  Herbold, Eric B.²  Homel, Michael A.²  Regueiro, Richard A.¹ 

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

关键词: 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#11;    ects;   

DOI  :  10.2172/1235391
RP-ID  :  LLNL--TR-679839
PID  :  OSTI ID: 1235391

美国|英语

来源: SciTech Connect

【 摘 要 】

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.