My $0.02 is to avoid including contact if you can given that you're doing a LDA. Contact with LD formulation is somewhat new to Simulate and isn't the most robust. Another issue with this model (when compared to your physical test results) is that you might need to account for a sharp change in the stiffness matrix with the snap through effect, which appears to be bugged at the moment.
I forgot to post this in your other thread, but I did make a more refined model where I removed the constraints that you were using to represent the tube and replaced with them spring elements and weighted-links. The model still needs more work (such as getting a better approximation of the contact area between the tube and the support).
