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Standard Contact - FKN (Normal Penalty Stiffness) vs. STRESS

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Vitkacy1989

Structural
Dec 8, 2012
54
Hi All,

Problem:

One of the most important parameters when setting up the Standard Contact is FKN value (Normal Penalty Stiffness).
FKN controls contact penetration value, thus drastically influencing stresses in neighboring elements.
FKN value is governing, e.g. if one of your plates in contact has stress higher than fy, simply rise FKN. Your stress will decrease below fy value.
But this cannot be the proper physical solution...

Question is:

What value of FKN recommend you to use for steel?
(e.g. one may calibrate FKN against contact penetration value so the latter will be equal to 0.01 mm, but is this number '0.01' really good enough for such an important reference?)

Your opinions are welcomed!
Regards,

Vitkacy
 
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