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The cold-drawn AISI 1018 steel bar shown in the figure is subjected to an axial load fluctuating between 800 and 3000 lbf. Estimate the factors of safety ny and nf using (a) a Gerber fatigue failure criterion as part of the designer’s fatigue diagram, and (b) an ASME-elliptic fatigue failure criterion as part of the designer’s fatigue diagram.

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