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[Jérôme Duriez <question700843@xxxxxxxxxxxxxxxxxxxxx>]

Question #700843 on Yade changed:
https://answers.launchpad.net/yade/+question/700843

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Above [1] and [2] point to a contact property between 2 Discrete
Elements, that's it.

If you take any DEM paper from the literature with some macro-scale
shear strength considerations (e.g. triaxial testing), and compare the
deduced material friction angle (e.g. Mohr-Coulomb criterion friction
angle) with that contact property you will see how different both can be
(except in few instances where you would be very lucky -- or unlucky --
and get an equality between the two).

See e.g.
https://www.sciencedirect.com/science/article/pii/S0266352X21005309
where Mohr Coulomb friction angle is above 35 degrees, vs a contact
friction angle at 31° for a polyhedron model ("Set 2 parameters" in
Table 5).

Most convincing example would certainly be your own YADE simulations of
triaxial tests, with zero FrictMat.frictionAngle.

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