1 Attachment(s)
Thin walled pressure vessel maximum stress - FLANGE ADDED
I have been trying to wrap my head around if a flange will change the maximum stress a material is exposed to to predict fatigue failure. I have not been able to find any information on clamped flange stress analysis for thin walled pressure vessels. I contemplated just using a simple Mohr's circle diagram, but I am still unsure what torsion the material will see, and if a flange makes any difference in calculations. I attached a sketch of what we are working with:
[ATTACH]2543[/ATTACH]
Basically the vessel is 304 stainless steel cylinder with a 1/8" thickness, inner diameter of 4.022", and a flange that has a soft 90 degree bend with about 1/2" of flange material to clamp on to. The same is repeated for both ends of the vessel, and it is pressurized to about 160 psi 100,000 times. Stress cracking forms at the bend of the flange at around 70k pressure cycles every time. I was hoping to get some pointers for how to find information on how a flange changes things in terms of torsion and load bearing, or any other helpful information.