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[Jérôme Duriez <question257929@xxxxxxxxxxxxxxxxxxxxx>]

Question #257929 on Yade changed:
https://answers.launchpad.net/yade/+question/257929

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Hi,

In the current state, interaction properties are generally not directly
derived on one unique set of material properties (or even two like in
your example). They are derived from the material properties of the two
interacting bodies, and of other properties of these two bodies.

E.g. the local stifness depends - in classical contact laws - on "young"
material properties (with young for body 1 possibly different that young
for body 2) and on bodies radii. So that the local stiffness between
spheres 105 and 203 is different than local stiffness between spheres
105 and 369. (and in fact this is done on purpose)

Maybe more related with your example, think also at the local friction angle. For which we have phi(interaction) = minimum( phi(material of body 1) , phi(material of body 2) )
Which allows us to have frictionless contacts between spheres and boundary bodies, whereas sphere-sphere contacts have friction.

So : maybe what you want is already possible, or (more probably ?) it is
not.

You will have to state clearly what you want to get a more precise
answer. And it will help us (and yourself) a lot if you state as clearly
as possible what are the interaction property, and what are the material
properties you have in mind. Regarding your question,
"shear/normalAdhesion" are interaction properties (in Newton). They do
not exist in the material. That's "shear/normalCohesion" (in Pascal)
that exist in the material.

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