Friction penalty formulation doubts in Radioss 2022
Silvio G.
Altair Community Member
Hello all,
I am modeling the pre-tensioning of a bolt in Radioss. To check for slipping, I compare the FT output from the contact interface with FN*static_friction. However, I notice that FT is always lower than FN*static_friction, even though the animations clearly show that the contact is in the slipping phase. I also noticed that slipping occurs when the external load crosses FN*static_friction, which is correct, but I would also expect that FT >= FN*static_friction during this phase. I tried to modify the stiffness of the contact, and FT/FN also vary, which is correct, since they are dependent from it.
Can someone explain how this is possible?
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