Nonlinear Analysis in Bellows

Hi all..

Warm Greetings...

I had some doubts in appying boundary conditions in the bellows with solidworks simulation.since the material is santoprene rubber we proceed with Nonlinear Analysis. kindlyshare your sugeestion for th attached file with the setup.

Addition to that, At  bottom there is Mild steel rod connected through the rubber contact.

Immediate reply will be appreciated.

SolidworksSimulation