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σ_hoop is in the circumferential direction (out of the plane here)
a = inner radius = 1.5 in

b = outer radius = 2 in
Assume the cylinders are 18 inches long and the vessel is pressurized to 1000 psi. Here, we will be interested in finding the hoop, axial and radial stresses at the mid-length of the cylinders (@ 9 inches), to neglect the local effects of the end caps.

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