Machine Design
Plastic flow in ductile materials

Increases the seriousness of static loading stress concentration
Has no effect on it
Lessens the seriousness of static loading stress concentration
Depends on other considerations

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Machine Design
The fatigue stress concentration factor is defined as

The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
All of these
The product of the endurance limits with and without stress concentration

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