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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> > > For Young, macro modulus is proportional to (1-2ν)kn, depending on packing
> > > density. (not yet published)
> ? if ks=kn then should be ν=0 and E∝kn
>
>   
Which "nu"?
In input parameters it would be nu=ks/kn=1.
In a sphere packing, ks=kn will not result in nu=0 either, or in very 
special cases with blocked rotations or other tricks.
Just trying to understand, many papers discussed this problem but I 
didn't hear somebody tackled the issue.

Bruno

p.s. It could be good to rename "nu" -> "alpha" for contacts. It would 
avoid confusion like now, and alpha is more common in papers. The 
modulus is really a modulus, no need to change the name.