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[Nasibeh Moradi <nasibeh.moradi@xxxxxxxxx>]

hi chiara,
thank you for your reply,

1- Uniaxial Strain Test is not a good test for verification of contact law?
2- why the uniaxial starin test give bad results (even with contact law in
YADE)?
3- In my law (written for a continuum case and its fracture) there are
tention, cohesion, compression, shear ,
      there are two kinds of stiffness for the contact, before fracture and
after fracture,
      with a simple case (a sphere-sphere interaction) I can check it?

Cheers,
Nasibeh Moradi


To test a contact law I would suggest you to take a very simple case, like a
> sphere-sphere interaction (or if you prefer a box-sphere interaction) as a
> case of study. What (generally) you check is that the numerical solution and
> the analytical solution you compare are the same. The numerical solution is
> that one you obtain by the code, like the normal force at contact with
> respect to the relative approach. The analytical solution is simply the law
> you implemented (still in this case the relationship between forces and
> displacements at contacts, both in the normal and tangential direction).
>
> According to the code, you can proceed both in displacement or force
> control. If you also include damping in the force law, you should check, for
> instance, the relative displacement over the time, so that your analytical
> solution is now the solution to the differential equation that represents
> the motion (easy to get it by hand).
> Read also this paper, it might be useful
> http://cedb.asce.org/cgi/WWWdisplay.cgi?160824
>
> cheers, Chiara
>
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