The no penetration option would make this a nonlinear buckling analysis and that is only available in the Simulation Premium package.
I too would have thought that your second test of adding a radial fixture for what was the contact region would increase the BLF not lower it.
I do not have my hands on Simulation right now to test myself.
What does your hand calculation say the buckling load should be?
How does the stress in the pin compare to yield stress?
I did something wrong in the setup yesterday, probably with the fixtures.
Windows decided to not let me save the file with the study, so I had to do it again this morning.
Now the results are as expected.
Ok, that explains it. I only have the Simulation Professional so nonlinear is not possible for me.
Hand calculation for this load case gave F = 1672 N compared to the actual load 3924 N. BLF = 0,42. My result yesterday was 0,13 but today, with the same 3d i got BLF = 0,42.
If I add a fixture on the 0,5 mm clearance (150 mm length) hand calc gives F = 3489 N, BLF = 0,89. Simulation gives BLF = 0,88.
Stress in the pin is only about 1/4 compared to yield stress.
Thank you both for your time.