Problem 1.311

What work has to be performed to make a hoop out of a steel band of length $l=2.0 \mathrm{~m},$ width $h=6.0 \mathrm{~cm},$ and thickness $\delta=2.0 \mathrm{~mm} ?$ The process is assumed to proceed within the elasticity range of the material.

A \approx 1 /_{6} \pi^{2} h \delta^{3} E / l=0.08 \mathrm{~kJ}

Elastic deformations