An unnotched circular rod with a diameter of 10 mm is subjected to constant amplitude bending at room temperature, with Sm = 200 Mpa. The material is 4340 quenched and tempered alloy steel with Su = 1240 Mpa, Sy = 1170 Mpa. If the rod is commercially polished, use modified Goodman and Basquien’s equation and estimate the value of Sa , Smin and Smax for a fatigue life of 50000 cycles.