On 21 April 2010 14:53, Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx
<mailto:bruno.chareyre@xxxxxxxxxxx>> wrote:
My simplest explanation is actually in the documentation of the
class, let me know if it is not clear enough :
/"The compliance of one sphere under symetric point loads is
defined here as 1/(E.D), with E the stiffness of the sphere and D
its diameter, and corresponds to a compliance 1/(2.E.D) from each
contact point. The compliance of the contact itself will be the
sum of compliances from each sphere, i.e. 1/(2.E.D1)+1/(2.E.D1) in
the general case, or 1/(E.D) in the special case of equal sizes.
Note that summing compliances corresponds to an harmonic average
of stiffnesss, which is how kn is actually computed in the
:yref:`Ip2_FrictMat_FrictMat_FrictPhys` functor."
/
Hi Bruno, in your explanation you reference the particles diameters,
in fact in Yade we use the radii so that if particles have same
geometry k_eq=E.R. I guess it does not really change the substance of
the matter.
cheers, Chiara
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