Discussion
All of the following improve fatigue life EXCEPT
Answer: C
Correct answer: Leaving a sharp corner at a section change
A sharp re-entrant corner is a stress raiser, and fatigue cracks start at stress raisers - so leaving one shortens the life rather than extending it. The other three all help: shot peening and cold working put the surface into residual compression, and a generous radius reduces the concentration factor at source.
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