Machine Design
Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to

Completely reversed loading
Combined static and dynamic loading
Dynamic loading
Static loading

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Machine Design
The flank of the tooth is the

Surface of the top of the tooth
Surface of the tooth below the pitch surface
Width of the tooth measured along the pitch circle
Surface of the tooth above the pitch surface

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