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[Bruno Chareyre <question403385@xxxxxxxxxxxxxxxxxxxxx>]

Question #403385 on Yade changed:
https://answers.launchpad.net/yade/+question/403385

Bruno Chareyre proposed the following answer:
Hi,
Short answer:
There is indeed no simple relationship between ks/kn and the material parameter called Poisson, but a dependency does exist (with both the solid phase Poisson coeff. and bulk scale Poisson) hence the conventional name.
Longer answer:
Since material parameters and interaction parameters in Yade are independent things (different functors will lead to different dependencies) it is not realistic to expect a physical consistency of the naming. In the end the parameter "Poisson" is just a value,  it doesn't have to be ks/kn - only some particular functors may really use it to define ks/kn.

Besides, I can't follow you on the question  "Can we set a geometry which lead to macro parameters the same as micro ones?"
If a particular micro-macro relationship (e.g. equality, in your case) exists the it should hold independently of the geometry of the specimen, else it is a physical aberration. So geometry is obviously not the right button to push to solve your problem.
Bruno

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