Machine Design
Factor of safety for fatigue loading is the ratio of

Young's modulus to the ultimate tensile strength
Endurance limit to the working stress
Elastic limit to the working stress
Elastic limit to the yield point

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

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Machine Design
The contact ratio is the ratio of

Length of arc of recess to the circular pitch
Length of arc of approach to the circular pitch
Length of path of contact to the circular pitch
Length of arc of contact to the circular pitch

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