The spindle shown in Sketch 1 is made of AISI 1020 steel, quenched and tempered at 870-C. with Sut= 550 MPa, Sy = 460 Mpa and fully corrected Se=110 MPa. For the most critical section determine fatigue factor of safety by modified Goodman criteria, if the shaft fail, determine the number of cycles, verify by yield and draw the graphical method for comaparison. The shaft is subject to a Tmax=800 N-m and Tmin=-800 N-m only. Dimensions of the various diameters shown in Sketch are d = 30 mm, D = 45 mm, and d2 = 40 mm. The support at the left is not a stress concentration factor. 0241 40 mm. r = 9 mm D 40 mm, r = 6 mm d T=50 40 mm, Tmax= 800 N-m, Tmin +-800 N-m