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## Homework Statement

A tube 40mm inside and 60mm outside dia is to be reinforced by shrinking on a tube of 80mm outside diameter. The compound tube is subjected to an internal pressure of 50MPa and the shrinkage allowance is such that the final maximum stress in each tube is the same. Determine the maximum stress and the difference in tube diameter before shrinkage. E=207000 N/mm^2

## Homework Equations

Lames equations:

Radial stress σr=A-B/r^2

Hoop stress σθ=A+B/r^2

## The Attempt at a Solution

Ive attempted the first part of the question however i have ended up with a negative maximum stress which cannot be. If someone could point out my mistake or give advice that would be great :)