(b) A shaft with a transverse hole that is made from an annealed AISI 1035 cold drawn steel is shown in Fig 3(b). The shaft diameter D = 20 mm and the transverse hole diameter d = 6 mm. Surfaces in the vicinity of the transverse hole have a machined finish. The endurance limit for this part is Se = 124.69 MPa and the modified stress concentration K 2.587. Calculate the fatigue factor of safety with respect to infinite fatigue life for: (i) A completely reversing torque, T, of 60 Nm. Explain your answer. (7 marks) (ii) A torque, T, fluctuating between 0 and 120 Nm. Use both the Modified Goodman and Gerber fatigue failure criteria for part (ii). Briefly explain your answers. T d Fig. 3(b) (10 marks) T