**Can one obtain a yield-locus from a single DEM simulation?**

Luding, S.^{1}

^{1} MSM – TS
- UTwente, The

DEM
simulations of ring shear cells (right) allow to study the non-equilibrium
behavior of granular materials under shear close to jamming. More specific, the
density, the stresses and the velocity gradient are extracted.

In the
split-bottom ring geometry, this data are plotted (below) as shear stress vs.
normal stress (pressure). If only the large shear rate data are given (large
symbols) one already has a yield locus.

Scaling
the shear stress by *p *displays clearly the non-linear nature of the
yield locus.

Material
parameters that can be varied involve particle size, size-distributions, fricton (right) and adhesion – among many others.

The
peculiar evolution of the anisotropy of stress and structure will be discussed.

• S. Luding,

*The effect of friction on wide
shear bands*

Particulate Science and
Technology 26(1), 33-42, 2008 [ PDF file ].

• S. Luding,

*Constitutive relations for the
Shear Band Evolution in Granular Matter under Large Strain *[ Particuology 6, 501-505, 2008 ], [ PDF file ] .