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Higher stresses for fillets rather than sharp corners? Simulation error?

Question asked by Alex Gardner on Sep 16, 2014
Latest reply on Sep 21, 2014 by Leonardo Presciuttini

I have a question here about something that doesn't seem to make sense to me. When I make a pressure vessel, and put a uniform pressure on the inside of it, I get higher values for the stresses for an internal pressure on rounded corners than I do for the same exact scenario with sharp corners? Can anyone explain this? I can't understand how these result could be correct. Attached is a picture of the pressure vessel and the corresponding results. The fixture and loading are exactly the same for each case. There is a uniform pressure on the inside of each vessel which is exactly the same for both cases. In fact, there is less surface area in the second case, therefore the net force on the inside of the vessel should be less....