1. The values shown below correspond to the maximum cyclic stress conditions that still result in long life (> 107 cycles) for a 0.4C-3.5Ni steel (heat treated) with a yield strength

of 109 ksi, an ultimate strength of 123 ksi and the true fracture strength is 173 ksi. Determine the stress amplitude, a, mean stress, om, stress ratio, R, amplitude ratio, A, and SWT equivalent fully reversed stress, Loading Condition for each of these cyclic stress conditions. Plot these values on a constant life diagram (i.e., Fig. 7.4(b) in Suresh) and also plot the Soderberg, Goodman, Gerber, Morrow, and SWT predictions on the same plot. Comment on how well each of these five methods work for this particular steel. a 200 D b с d e f bo SWT Tar = g omax Ja Maximum Stress (ksi) 60 68 66 83 96 100 101 Minimum Stress (ksi) -60 -54 -44 -33 0 29 51