Machine Design
Spring index is

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

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

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

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