Machine Design
The elasticity is the property of a material which enables it to

Draw into wires by the application of a tensile force
Regains its original shape after deformation when the external forces are removed
Resists fracture due to high impact loads
Retain deformation produced under load permanently

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Machine Design
In a hydrodynamic lubricated bearing

There is no lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure
There is a thin film of lubricant between the journal and the bearing
There is a thick film of lubricant between the journal and the bearing

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Machine Design
Spring index is

Indication of quality of spring
Its capability of storing energy
Load required to produce unit deflection
Ratio of coil diameter to wire diameter

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