A compounded steel shaft, ABCD, has a total length of 540 mm: AB = 150 mm, BC = 150 mm and CD = 240 mm. AB is a hollow shaft with inside and outside diameters of 30 mm and 40 mm respectively; BC and CD are solid shafts of which the diameter of BC is 40 mm. Take Gₛₜₑₑₗ = 80 GPa.
Calculate:
The diameter of CD if the angle of twist of CD is equal to that of AB
