Question #222363 on Yade changed:
https://answers.launchpad.net/yade/+question/222363
Status: Open => Answered
Luc Scholtès proposed the following answer:
Hi Henry,
The use of Young and Poisson in YADE can be confusing. Actually, those
two parameters define the normal and shear stiffnesses as you mentioned.
Their names come from the fact that they influence the value of the
Young modulus and of the Poisson's ratio of the assembly. Of course, the
relationship between micro-parameters and macro-properties is not direct
and it depends on the assembly you use (orthogonal, hexagonal,
random,...).
For the basic laws in YADE, the stiffnesses are defined according to
those equations:
Kn=2.*E*R1*E*R2/(E*R1+E*R2) (1)
Ks/Kn=P (2)
with E the "Young" parameter and P the "Poisson" parameter.
In the paper you mentioned, I gave values of kn and ks computed
according to (1) and (2) for the average radius of the assembly I used.
Hope it helps
Luc
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