A new Approach for Modeling the Normal Contact withinGranular Assemblies through the Discrete Element Method

摘要

For the simulation of dense granular systems the Discrete Element Method based on a soft-sphereapproach is commonly used. In such simulations collisions between particles take a finite time. Theequations of motion are applied for each particle and solved numerically. Therefore models for theforces acting between particles in contact need to be specified. In this paper the focus is set on normalcontacts. Based on macroscopic accessible parameters like coefficient of restitution, collision time,force, displacement and displacement rate a wide range of commonly used force schemes arereviewed. Results obtained from these commonly used models are compared to experimental data.Due to obvious limitations extensions are presented. The new extended models are compared toexperimental data and their accuracy is discussed.