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

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

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Machine Design
When a machine member is subjected to torsion, the torsional shear stress set up in the member is

Maximum at both the centroidal axis and outer surface of the member
Maximum at the centroidal axis and zero at the outer surface of the member
Zero at both the centroidal axis and outer surface of the member
Zero at the centroidal axis and maximum at the outer surface of the member

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