2. The rotating shaft below is supported as a mechanical cantilever beam; it is able to take bending moment M and torque T, and T=M in magnitudes. Consider a high-cycle fatigue with 106 N 10. Steel (Sut = 900MPa) is used, and the shaft life is expected to be in 90,000 cycles. All forces (torque, moments) are static. The shaft diameter is d =50 mm, and the factor of safety is SF=1.1. The stress concentration factor for torsional shear stress is K-2.8, and that for bending normal stress is KF2. The fatigue strength modification factors are kjkskrkkm 0.82. a) Determine the fatigue strength of the material, Sf'. b) Determine the magnitudes of torque, T, and the bending moment, M. M T