Force chain characteristics of dense particles sheared between parallel-plate friction system

Using the discrete element method, we investigate the force chain characteristics of dense particles in a parallelplate particle flow friction system, and considering the influence of pressure load as well as shear velocity. Simulation results show that the shear dilatancy process of this particle friction system can be divided into three typical stages: plastic expansion stage, whole flow stage, and plastic compression stage. The distribution of force chain generally decreases with the increase of dimensionless contact force f. The distribution and bearing rates of force chains depend on the pressure load as well as the shear velocity. The direction of force chain gradually changes closer to the y-axis with the increase of the pressure load, and shifts from y-axis to x-axis with the increase of shear velocity. The magnitude of the total force chain decreases with shear velocity. Moreover, the total force chain fluctuates significantly at lower shear velocity and start-up stage.

Automated summary

The force chain characteristics of dense particles in a parallel-plate particle flow friction system were investigated using the discrete element method, taking into account pressure load and shear velocity influences. The shear dilatancy process of this system can be categorized into three stages: plastic expansion, whole flow, and plastic compression. The distribution and bearing rates of force chains are dependent on pressure load and shear velocity, with force chain direction changing with varying levels of these factors. The magnitude of the total force chain decreases with shear velocity, and significant fluctuations are observed at lower shear velocities and during start-up stages.