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[Vincent Richefeu <richefeu@xxxxxxxxxxxxxxx>]

Just a pdf file I found on the web: http://www.m-hikari.com/ces/ces2009/ces1-4-2009/teufelsbauerCES1-4-2009.pdf
Maybe it helps !?
Ciao
Vincent

Le 23 févr. 2011 à 19:01, Chiara Modenese a écrit :

> Hi Bruno and Vincent,
> 
> thanks for your answers. 
> 
> 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?). I could not find out where the PFC formulas come from, that is why I asked to you about that so to have an alternative. 
> 
> I appreciate your help (Sergei, perhaps you have also been using viscous contacts, any ideas about the critical time step?).
> 
> Chiara