고체역학 (Beer) — Principal Stresses Under a Given Loading: Problem 8.16

8.16 Determine the smallest allowable diameter of the solid shaft $ABCD$, knowing that $\tau_{all} = 60\text{ MPa}$ and that the radius of disk $B$ is $r = 120\text{ mm}$. (Note: This problem refers to Fig. P8.15 and P8.16 which shows a vertical shaft with bearings at $A$ and $C$, a disk at $B$, and a torque $T = 600\text{ N}\cdot\text{m}$ applied at $D$. Distances: $AB = 150\text{ mm}$, $BC = 150\text{ mm}$).