6-25 The cold-drawn AISI 1040 steel bar shown in the figure is subjected to a completely reversed axial load fluctuating between 28 kN in compression to 28 kN in tension. Estimate the fatigue factor of safety based on achieving infinite life and the yielding factor of safety. If infinite life is not predicted, estimate the number of cycles to failure. er G-mm D. 25 mm -+ Problem 6-25 10 mm 6-26 Repeat Problem 6–25 for a load that fluctuates from 12 kN to 28 kN. Use the Goodman, Gerber, and Morrow criteria and compare their predictions.

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