Machine Design
In hydrodynamic bearings

The oil film pressure is generated only by the rotation of the journal
Grease is used for lubrication
The oil film is maintained by supplying oil under pressure
Do not require external supply of lubricant

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

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