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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

>     Twist slip is probably the most realistic plastic behaviour for
>     sphere-sphere contacts
>     (consistent with HM!!).
> 
> I think it would be nice to have that value, but I think we would need
> to define the contact area first.

Implementing twist plasticity and defining the value of the threshold are independant
aspects. The first doesn't need the latest, but I understand if it is not a priority.

> Anyway, in this case I will see later
> what to do. For now, one can set the ktwist=0 so that no twist is indeed
> applied.

Sure. Thanks for input. :-)

Bruno