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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Hi Vaclav,

I'm back to the periodic triax with changing friction. It seems there is 
still an effect of changing friction even after the "/ks" fix.
Sorry if I make you repeat but something is still not clear for me, and 
reading this code is hard.

Is this correct (regarding Dem3DofGeom_SphereSphere):
1. Initial orientations ori1 and ori2, are never modified.
2. Consequence : the shear disp given by displacementT() is always the 
total displacement (plastic+elastic), based on initials ori1 and ori2.
3. After slipToDisplacementTMax(), the total displacement is reduced in 
order to be the elastic part only?

In such case, I understand that the shear force will always increase if 
friction is increased.
I also conclude that the shear force will be always colinear to the 
total displacement (said otherwise : elastic and plastic displacement 
are always colinear). Is it correct? Isn't it weird?

Bruno


> > if(trialFs.SquaredLength()>maxFsSq){ 
> > geom->slipToDisplacementTMax(sqrt(maxFsSq));
> It is |displacementT|  that should be
> passed as argument. I suppose it should read sqrt(maxFsSq)/ks, right?
>
>