Effects of elasticity on the shape of measured shear signal in two-dimensional assembly of disks

TL;DR

This study uses Molecular Dynamics to analyze how elasticity influences the shear force signals in a 2D disk assembly, revealing different signal behaviors based on shear rate and elasticity.

Contribution

It demonstrates how elasticity and shear rate affect the regularity and shape of shear force signals in a 2D disk system, providing insights into signal behavior under different conditions.

Findings

Shear force signals can be irregular or regular in shape depending on conditions.

Elasticity and shear rate determine the regularity of the shear force signal.

Different signal behaviors are observed with varying experimental parameters.

Abstract

A Molecular Dynamics approach has been used to compute the shear force resulting from the shearing of disks. Two-dimensional monodisperse disks have been put in an horizontal and rectangular shearing cell with periodic boundary conditions on right and left hand sides. The shear is applied by pulling the cover of the cell either at a constant rate or by pulling a spring, linked to the cover, with a constant force. Depending on the rate of shearing and on the elasticity of the whole set up, we showed that the measured shear force signal is either irregular in time, regular in time but not in shape, or regular in shape.