A hollow tube is employed in the design of a shaft to transmit 8 kW of power at 7400 RPM with a safety factor of 1 with respect to yielding. Determine the outside diameter dO of the tube if its wall thickness is 0.05?dO. The tube is fabricated from 1020 HR steel.
1020HR properties:
Su (Ultimate Tensile Strength) =455 MPa
Sy (Yield Strength) =290 MPa