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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

>
> I have PFC manual on my desk (though I never directly used that code)
> and they do define also contact viscous damping. In order to modify
> the time step to account for damping effects, they re-define the
> tangential and normal stiffness such that their values are increased
> by some factors. Hence, the critical time step for viscous contacts
> should result be smaller than the one for non-viscous contacts (do you
> agree?).
(Yes I agree)
Indeed, I see that in PFC3D manual too now. You prooved that I should
read PFC manual again because they added new paragraphs since PFC2D
v1.00. ;-)
They mention Belytschko (1983) for critical timestep determination, why
not look there first?

Bruno