How do you calculate the radial compressive strength of thin walled tubes? I want to test shape stability.
I have 4 tubes to compare and find the best material and/or shape which resists a collapsing force. All are open ended cylinders. Base case is alloy x, t=1. Second tube is alloy x, t=1.5. Third is alloy y, t=1 and fourth is alloy y, t=3/4 but is a corrogated tube whereas the others are straight cylinder walls. I want to show a force factor for each tube option (i.e. tube #1take 5 lbs. to collaps, #2 takes 10 lbs., etc. I can’t find the equations to show me what a 5 lb. distributed load over the length means in radial force.
Autofrettage is a manufacturing process whereby a thick-walled cylindrical pressure vessel is pressurized well beyond its elastic limit. This pressurization causes the tube’s interior to undergo plastic deformation. Under such a loading, the radial component of the stress throughout the tube’s wall thickness is compressive, while the tangential component is mainly tensile. In very thick-walled tubes with a significant plastically deformed inner sleeve, the tangential stress component near the bore may also become compressive. However, upon depressurization, both the radial and the tangential components of the stress near the tube’s bore are compressive. Likewise, the stress distribution throughout the wall thickness of a press-fitted liner inside a thick-walled tube is compressive for both the radial and tangential components. It has long been established that autofrettage of a pressure vessel, before putting it into service, increases its fatigue life. However, the optimal amount of a
