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

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

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Machine Design
In case of thick cylinders, the tangential stress across the thickness of cylinder is

Maximum at the inner surface and zero at the outer surface
Maximum at the inner surface and minimum at the outer surface
Maximum at the outer surface and zero at the inner surface
Maximum at the outer surface and minimum at the inner surface

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