that kn influence the macro parameter E of the sample, but that there
is also a relationship between alpha=ks/kn and nu (macro).
Probably I am interpreting something in the wrong way. Could you
clarify me on this point, please? Is there a dependence somehow?
Thanks a lot.
Chiara
Hi, I don't really understand your question... explanation given by
Bruno and your citation from the paper are not antagonistic:
kn mostly influence the macroscopic Young modulus,
and the ratio ks/kn mostly influence the Poisson's ratio.
Luc
Indeed, we are all saying the same thing.
There is a strong property : Poisson's ratio is influenced ONLY by ks/kn
(also by porosity, size distribution, etc, but not by other parameters
of the contact law : E and friction).
However, proving that a relationship exists is one thing, giving the
exact relationship is something else. There are many papers showing the
dependance, or deriving approximate relations in particular cases, but I
don't know one giving nu as a function of {ks/kn, porosity, PSD,
fabric,[put whatever comes to mind]}.
Even worst, packing properties are anisotropic as soon as the loading is
not pure isotropic compression, so that we should not speak of "nu", but
nu_xy, nu_xz, etc.
Bruno
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