Question: A 12.5 mm (0.50 in.) diameter cylindrical rod fabricated from a 2014-T6 alloy (Figure) is subjected to a repeated tension-compression load cycling along its axis.

A 12.5 mm (0.50 in.) diameter cylindrical rod fabricated from a 2014-T6 alloy (Figure) is subjected to a repeated tension-compression load cycling along its axis. Compute the maximum and minimum loads that will be applied to yield a fatigue life of 1.0 ? 10⁷ cycles. Assume that the stress plotted on the vertical axis is stress amplitude, and data were taken for a mean stress of 50MPa (7250psi).

80 500 70 60 400 50 1045 steel 300 40 2014-T6 aluminum

80 500 70 60 400 50 1045 steel 300 40 2014-T6 aluminum alloy 30 200 20 100 10 Red brass 10 107 104 105 10 10 100 1010 Cycles to failure. N Stress amplitude. S (MPa) (sd 01) epnydwe ssens

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