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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Machine Design
Stress concentration is caused due to

Variation in properties of material from point to point in a member
Pitting at points or areas at which loads on a member are applied
Abrupt change of section
All of these

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