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

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

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Machine Design
In composite or reverse laid ropes

Wires are not twisted
Direction of twist of wires and strands are same
Direction of twist of wires in strands is opposite to the direction of twist of strands
Wires in two adjacent strands are twisted in opposite direction

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