About contact force-laws for cohesive frictional materials in 2D and 3D

摘要: Ultrafine, cohesive powders are the subject of joint research project. While shear experiments and contact force measurements were performed by project partners, realistic models developed in a common effort. The algorithms for their implementation presented here, involving elastic-plastic repulsion, dissipation, adhesion, friction as well rolling- torsion-resistance. In model powder systems, effect properties on an isotropic, homogeneous compaction test is discussed with respect to packing densities. With forces sliding, rolling torsion frictions, volume fractions down 0.42 achieved. Some longer ranged van der Waals adhesion added can lead considerably smaller, fractal-like agglomerates.