A nickel-based alloy (INCONEL^® alloy 801) beam (Figure 7-29) is annealed and subjected to a cyclical load of 100 N with equal maximum and minimum stresses. The beam diameter is 5 mm, and the beam length is 50 mm. What is the expected lifetime of the beam in number of cycles to failure? If the cycle frequency is 10 Hz, what is the lifetime in hours?

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Stress (ksi) 70 65 60 55 50 45 40 35 30 105 106 Cycles to failure 107 450 400 350 300 250 10% Stress (MPa)