Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is

Compressive stress
Shear stress
Bending stress
Tensile stress

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Machine Design
In hydrodynamic bearings

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

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