A steel shaft is subjected to a twisting moment (Torque) of 10677 N. m and maximum bending moment of 5423 N. m. - Find the required diameter of the shaft to prevent yielding in Tresca criteria. Yield strength σY = 413 MPa Another steel shaft is now subjected to a fluctuating axial load that varies from a minimum of 10000 N in compression to a maximum of 40000 N in tension, and a completely reversed bending moment of 2000 N. m - Find the required diameter of the shaft to prevent failure by fatigue σu = 690 pa (Tensile strength) and σe = 345 pa (endurance imit) and S. F.=1