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["Sergei D." <dorofeenko@xxxxxxxxx>]

> Anyhow, according to the equations cited in PFC manual, the critical 
> time step would be smaller for viscous contacts even if the solution 
> is underdamped (at least for the linear dashpot model). Am I 
> overlooking something? Why would be the contrary to you? Sorry, I 
> admit I have no great expertise on this precise topic.
Just a guess. A loading path is equal to a unloading path for a elastic 
contact.
For a viscoelastic contact, the loading path is above the unloading 
path. So,  viscoelastic loading force more then elastic force for given 
overlap. So, need smaller time step for stability. No?

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Best regards,
Sergei D.