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Link friction to damping

Link friction to damping

Link friction to damping

(OP)
Hi,

is it possible to retrieve a relationship between friction and damping?
I run a non-linear transient solution (Nastran SOL 129) of a model in which I modelled the friction effect using CGAP elements. What I see is that, because of the dissipation, the response at resonance has a lower amplitude with respect to the linear analysis (SOL 109 with CBUSH instead of the gap elements). This amplitude reduction can be seen as a change in the Q factor, which in linear analysis is given as Q = 1/G (where G is the structural damping).
Is there a way to link the friction to the Q factor? I would like to try to model the non-linear element using NOLIN cards (thus as a force, not an actual element), but NOLINs define non-linear damping not friction, therefore I need to find a sort of equivalent damping which resemble the friction.

Thank you
Regards

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