Homework

Show that the stress function $\frac{O}{?}=k(r^2-a^2)$ is applicable to the soution of a solid circular section bar of radius a$.$ Determine the stess distribution in the bar in terms of the applied torque, the $ra$ e of twist, and the warping of the cross$-$section. Is it possible to $-$ise this stress function in the solution for a circular bar of a holow section?

Show that the stress function $($:$3x^{y^2}$