# General equation for press/shrink fit stress?

by cowpuppy
Tags: equation, press or shrink, stress
 Sci Advisor P: 1,498 Basically you can use superposition to find this. There is an interference, call it e. You can find the pressure which would cause that expansion e. The stress in the shaft from the interference will then be the stress caused from that pressure. It should be all hoop stress if I'm not mistaken. Looked it up, from Roark, you have the radial displacement $$\Delta R = \frac{qR^2}{Et}$$ The idea is then to find q that causes your interference R. Then your meridional stress is zero, while your hoop stress is $$\sigma_2 = \frac{qR}{t}$$ Good luck,