I saw that you are doing a pre-stressed modal analysis so you need to have in mind that modal is linear and contacts are nonlinear. Thus contacts are linearised.


Also the perturb command shows how contacts are treated - search for that in help or google (PERTURB and ansys)

The sticking option valid for frictional contacts generates a frictional tangential contact stiffness at the interface thus the closed contact can not slide that much depending on the tangential contact stiffness.




For more info on this see:



As for your set up and the behaviour it seems realistic  and behaves normal, and as one would expect. Also leave the contacts to default if you are not sure 100% what you are doing. Say bonded could be more ok with MPC not with penalty.