Machine Design
Spring index is

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

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

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

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