Asection of shaft diameter, d, joined to a section of diameter with fillet which produces an actual stress concentration factor of kf-1.22 for a shaft in torsion. take sys-560mpa and sn-375mpa. using a size factor of 0.85, surface finish factor of 0.85 and a load factor of 0.6, determine the size of the shaft required for a torque which varies from 0 to 2.26 kn-m. use design factor of 2.0