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After further exploring the CBUSH element, I think it has to do with the orientation of the element not updating with the displacement of the nodes. This leads to incorrect results for large displacements.

Dear Sir/Madam, I am modelling a system which contains a hinge. The hinge angle is related to the applied torque according to a hysteresis cycle, something like: Torque=k1*Angle+k2, where k1 and k2 are constants. In particular, the torque vs angle relationship is as shown in blue in the figure...

Thank you very much for your detailed reply sir.

Dear Sir/Madam, The unit enforcement displacement and rotation valitidy check is a check described in the following link, in the FEMCI book: https://femci.gsfc.nasa.gov/validitychecks/vc1.html Basically, it consists on setting free all nodes of the model except one, which is given a unit...