Problem

A steel ring of rectangular crass$-$secrion $1518mm$ is shrunk on a copper of $1515$ mm cross$-$fection to form a composite ring of $30$ mm radial depth and $300$ mm radius. The shrinkage pressure created between the rings is $1$ MPa $.$ Calculate the stresses in steel and copper due to shrinking. If the composite ring rotates at $2000$ rpm what will be the stresses in steel and copper. The densities of steel and copper respectively are $7800k\frac{g}{m^3}$ and $8900k\frac{g}{m^3}$ while their respective modulit of elasticity are $20010$MPa and $10010$MPa.