Discussion
Fatigue failure occurs at stress levels
Answer: A
Correct answer: Below the static ultimate, under repetition
This is the whole point of fatigue and the reason it took so long to be recognised. A member loaded once to a stress well within its static capability may fail after enough repetitions of that same stress, because each cycle does a small amount of irreversible damage at a slip band or an inclusion. A static calculation cannot detect the danger.
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