Discussion
The stress ratio for a completely reversed cyclic loading during a fatigue test is
Answer: C
The stress ratio is -1.
The stress ratio is R = σmin/σmax. In completely reversed loading the stress swings between equal tensile and compressive values, σmin = -σmax, so R = -1 and the mean stress is zero.
R = 0 describes zero-to-tension (pulsating) loading, R = 1 a static load with no cycling, and -1/2 a cycle whose compressive peak is half the tensile peak.
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