The fatigue stress concentration factor is defined as

1.	The fatigue stress concentration factor is defined as
A.	The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
B.	The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
C.	The product of the endurance limits with and without stress concentration
D.	All of the above
Answer» C. The product of the endurance limits with and without stress concentration

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The fatigue stress concentration factor is defined as

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