yade-users team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

<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