The Effects of Pins on Force Chains in a Granular System: A Simulation
Author:
Jackson Lewis ’27Co-Authors:
AKM Sadman Mahmud, Jean Luc Ishimwe, Xiang Li, Junhyuk Kim, Michael J. Bolish1, Amin DaneshCacey S. Bester, Brian Utter, Amy L. Graves, Katharina Vollmayr-LeeFaculty Mentor(s):
Katharina Vollmayr-LeeFunding Source:
NSFAbstract
Granular media are large collections of disordered macroscopic particles interacting via dissipative forces. We use molecular dynamics simulations to study a two-dimensional, 50:50 binary mixture of purely repulsive harmonic disks of radii 1:1.4. By freezing the top and bottom walls of particles we shear the system at a constant rate and apply dissipative interactions depending on relative velocity. We study how force chains are influenced by the addition of fixed minuscule disks of radius 0.004 placed on a square lattice. We study the forces Fij between particles i and j. We will present distributions P(Fij) both for the complete system as well as for layers. We also study the system both near the jamming transition at p = .00025 as well as slightly above the transition at p = 0.001. We compare the distributions in steady state during the shear.