The factor of safety against fatigue endurance as per Soderberg’s criterion is

Question

A forged steel link with uniform diameter of 30 mm at the centre is subjected to an axial force that verses from 40 kN in compression to 160 kN in tension. The tensile (S_U), yield (S_y) and corrected endurance (S_e) strengths of steep material are 600 MPa, 420 MPa and 240 MPa respectively. The factor of safety against fatigue endurance as per Soderberg’s criterion is                       

      (a) 1.26                                                               (b) 1.37

      (c) 1.45                                                               (d) 2.00