Suppose that the fatigue data for the brass alloy in Problem 8.18 were taken from torsional tests,

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Suppose that the fatigue data for the brass alloy in Problem 8.18 were taken from torsional tests, and that a shaft of this alloy is to be used for a coupling that is attached to an electric motor operating at 1500 rpm. Give the maximum torsional stress amplitude possible for each of the following lifetimes of the coupling:

(a) 1 year,

(b) 1 month,

(c) 1 day, and

(d) 2 hours.

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