Hi everybody,

So, i'm trying to simulate the model that i show in annex but i've realized something and don't know what to think about it.

I want to test the model to the vacuum pressure, and found that if the collar wall thikness is 1mm or 8mm there is no difference in the stress output.. how is this possible? Do i have to make this simmulation using pressure vessel conditions?

Thank you in advance,

Best regards.

Is this attached to something else? Do you have your stress and deflection results? Did you apply a negative pressure? Seems more logical to apply a pressure to the outside but you should get about the same results. Have you done any hand calculations?