Abstract
Understanding how cohesive granular materials behave is of interest for many industrial applications, such as pharmaceutical or food and civil engineering. Models of the behaviour of granular materials on the microscopic scale can be used to obtain macroscopic continuum relations by a micro-macro transition approach. The Discrete Element Method (DEM) is used to inspect the influence of cohesion on the micro and macro behaviour of granular assemblies by using an elasto-plastic cohesive contact model. Interestingly, we observe that frictional samples prepared with different cohesion values show a significant difference in pressure and coordination number in the jammed regime; the differences become more pronounced when packings are closer to the jamming density, i.e. the lowest density where the system is mechanically stable. Furthermore, we observe that cohesion has an influence on the jamming density for frictional samples, but there is no influence on the jamming density for frictionless samples.
Highlights
We use the Discrete Element Method (DEM) to understand the behaviour of granular systems
In the case where the samples are prepared without friction, we see no significant changes in the pressure, throughout the whole regime (figure 3(a)) and in the coordination number at high volume fraction (figure 4(a)), for different cohesion values
Frictionless and frictional samples were prepared with different interparticle cohesion
Summary
We use the Discrete Element Method (DEM) to understand the behaviour of granular systems. We relate the force interacting between the particles to the overlap δ that the particles have with each other. DEM solves Newton’s equations of motion for all forces fi = f nn + f tt acting on particle i for the translational and rotational degrees of freedom
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