well, it's not just a matter of accuracy : Fp=14612 lbf while sigmaP1*As=21922 lbf , the two "candidate" axial forces (due to pressure) are rather inconsistent each other. I would definitely discard the first and take the second. In a real life simulation it would be far harder to recognize such inconsistencies, and this is the reason I'd like to understand what lies behind the numbers. In this regard you have been of great help. thank you for the nice discussion
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