Granular materials can be studied in a split-bottom ring shear cell geometry,
where they show wide shear bands under slow, quasi-static, large deformation.
The contact models are at the basis of their interesting collective behavior
and flow-rheology as well the core ingredient for the discrete element method
(DEM). The contact mechanics used involves elasto-plastic, viscous, frictional,
and torque contributions.
From a single simulation only, by applying time- and (local) space-averaging,
and focusing on the regions of the system that experienced considerable deformations,
the critical-state yield stress (termination locus) can be obtained. It is
close to linear, for non-cohesive granular materials, and nonlinear with peculiar
pressure dependence, for adhesive powders – due to the nonlinear dependence
of the contact adhesion on the confining forces.
|Title of host publication||New Trends in Contact Mechanics|
|Place of Publication||Cargese, Corsica|
|Number of pages||4|
|Publication status||Published - 27 Mar 2012|
|Event||Euromech 514: New Trends in Contact Mechanics - Cargese, Corsica, Cargese, Corsica|
Duration: 27 Mar 2012 → 31 Mar 2012
|Period||27/03/12 → 31/03/12|
|Other||2012-03-27 - 2012-03-31|