Machine Design
Auto frettage is the method of

Joining thick cylinders
Pre-stressing thick cylinders
Increasing the life of thick cylinders
Calculating stresses in thick cylinders

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Machine Design
The fatigue stress concentration factor is defined as

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

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