<http://www.springerlink.com/content/412t27w5955643jl/>Hello
I saw the files of yade but I don't underestand how the Kn , Ks are
calculated,
In the frictional model, there is no tension, that is true. I think you
need Cpm (or CohesiveFrictionalLaw) if you want tension.
I all cases, kn/ks are user-defined constants, function of modulus, size
of elements, and ration ks/kn. In Ip2_FrictMat_FrictMat_FrictPhys or in
CohesiveFrictionalRelationShips, it will give Kn=E*d, in Cpm it will be
Kn=pi/2*E*d (right?). In both cases, you can just invert the relations
to define which "E" corresponds to your desired Kn.
I know that Cpm is for Concrete but in the other law it seems that
there is no tension,
the model in the above papers is not for particular material and Kn,
Ks is only depend
E, poisson' ratio and sphere radius.
Cpm being for concrete should not be a problem, you don't need to write
any code as long as you want the same simple laws as in your papers.
Besides, in Alonso's paper, Kn/Ks depend not only on E, Poisson and
size, they also depend on the considered packing arrangement. Which one
do you choose?
Bruno
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