Modelling particle kinetic behaviour considering asperity contact: formulation and DEM simulations

Abstract

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Influence of small particle surface asperities on macro and micro mechanical behavior of granular material

“…It has been shown that numerical discrete element method (DEM) 3 simulations that use idealized circular or spherical particles cannot quantitatively reproduce the mechanical behavior of natural sand, often underrepresenting the shear strength 4 . Particle shape is a general concept that incorporates both intermediate scale measures including sphericity and roundness and small scale measures such as surface asperities 1,5,6 . Here, surface asperities refer to the unevenness, roughness, or ruggedness of the particle surface, which is inevitable for even apparently regular shaped particles, visible in Figure 1A–C.…”

Independent friction-restitution modeling of two-disk collisions

“…Collisions are extensively treated in the mechanics literature dealing with fluid mechanics, [1][2][3][4][5][6] granular matter, [7][8][9] and aerosol science, 10,11 among other fields. Much of this research is focused on the impact of spheres on surfaces [12][13][14][15][16][17] and two-sphere collisions.…”

ارزیابی اثر میرایی محلی در مدل‌سازی سه بعدی رفتار استاتیکی و دینامیکی مصالح دانه‌یی با استفاده از روش اجزاء منفصل

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