A hollow shaft whose ratio of internal diameter to external diameter (k) is 0.5, transmits 1.5 kW at 1400 rpm. At a certain section it is also subjected to a bending moment of 5 N.m. The shaft is to be made from chrome-vanadium steel having allowable shearing stress of 200 MPa. Design the shaft using the ASME code formula for transmission shafting as given below :
D0 (outer diameter)
Combined shock and fatigue factor for bending moment (Cm) is 1.5.
Combined shock and fatigue factor for torque (Ct) = 1.0.
Determine the internal and outer diameter of the shaft.