Discussion
A cycle of amplitude \( 40 \) MPa at zero mean has a life of \( 10^6 \) cycles. Adding a tensile mean stress will make the life
Answer: C
Correct answer: Shorter than a million cycles
Adding a tensile mean stress to a cycle of the same amplitude always shortens the life, because the crack spends more of the cycle open. The Goodman relation gives the size of the effect: the permissible amplitude falls roughly linearly as the mean stress approaches the ultimate strength.
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