A contact model for sticking of adhesive meso-particles

摘要: The interaction between visco-elasto-plastic and adhesive particles is the subject of this study, where "meso-particles" are introduced, i.e., simplified particles, whose contact mechanics not taken into account in all details. A few examples meso-particles include agglomerates or groups primary inhomogeneous with micro-structures scale deformation, such as core-shell materials. simple, flexible model for proposed, which allows to bulk behavior assemblies many both rapid slow, quasi-static flow situations. An attempt made categorize existing models normal force, discuss essential mechanical ingredients that must enter (qualitatively) finally solve it analytically. combines a short-ranged, non-contact part (resembling either dry wet materials) an elaborate, law. Using energy conservation arguments, analytical expression coefficient restitution derived terms impact velocity (for pair interactions or, equivalently, without loss generality, situations maximum overlap confining stress). Adhesive (or meso-particles) stick each other at very low velocity, while they rebound less dissipatively increasing agreement previous studies. For even higher velocities interesting second sticking regime reported. due forces, first stronger elastic kinetic energies little dissipation, high generated by non-linearly increasing, history dependent plastic dissipation force.