Machine Design
Stress concentration factor is defined as the ratio of

Nominal stress to the endurance limit
Nominal stress to the maximum stress
Maximum stress to the endurance limit
Maximum stress to the nominal stress

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Machine Design
In hydrodynamic bearings

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

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