Thanks a lot. Now, I understand a bit more...
The implanted law is for sphere-sphere contacts.
I suggest something (tell me your opinion please): what about
computing cn and cs for each contact as a function of the
corresponding effective mass?
In this way, the parameters would be kn,en,ks, and es.
What is en, es? Is this a restitution coefficients? Please, give me
more
info.
Yes, en and es are normal and tangential coefficients of restitution
(ratio of velocities after and before the 'impact': vf/vi).
I wanted to say that the parameters in
SimpleViscoelasticBodyParameters could be the stiffnesses and
restitution coefficients. Then, the effective mass together with the
viscous constants could be determined in
SimpleViscoelasticRelationships (maybe with the equations you showed
me).
Note that my aim is NOT to criticism your implantation of the law (I
think it's correct). I just want to have an opinion.
Vincent
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