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[Jerome Duriez <duriez@xxxxxxxxxxxxxxx>]

Le 25/02/2011 14:32, Sergei D. a écrit :
> But you speak about elastoplastic law with different stiffness for 
> loading/unloading.
> I speak about viscoelastic law (with constant stiffness):
> F = k x + c dx/dt
> So, if dx/dt>0 (loading) then F > F_elastic=k x,
> and if dx/dt<0 (unloading) then F<F_elastic
> ok?

Ok for these inequalities ! Thanks for explanations.
And so you suggest to use this comparison of force values to deduce 
something about time steps ? In fact, that's the point that makes me doubt ?