A shaft has to transmit a torque of 30 kNm. The maximum shear stress is not to exceed 100 MPa and the angle of twist is not to exceed 1 “/meter length. G = 80 GPa. Design the shaft according to the...

A shaft has to transmit a torque of 30 kNm. The maximum shear stress is not to exceed 100 MPa and the angle of twist is not to exceed 1 “/meter length. G = 80 GPa. Design the shaft according to the given specifications if it is a (i) solid circular shaft and (ii) hollow circular shaft of internal diameter 90% of the external diameter