Machine Design
In cyclic loading, stress concentration is more serious in

Elastic materials
Brittle materials
Ductile materials
Brittle as well as ductile materials

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Machine Design
The fatigue stress concentration factor is defined as

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

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