Q.4 The section of a steel shaft is shown in figure. The shaft is machined by a turning process. The section at xx is subjected to a const. moment of 500 KN-m. The shaft bending material has cultimate tensile strength of 500 MN/m yield point of 350 MN/m and endurance limit in bending for a 7.5mm diameter specimen of 210 MN/m. The notch sensitivity factor. can be taken as 0.8. The theoritical stress concentra from following -tion factor may be interpolated from tabulated values: 0.025 0.05 0.1 K 2-6 2015 1.66 $450 $300 8mm Lxx where, of is fillet radius, d is diameter of shaft. The reliability is 90%. Determine the life of the shaft.