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

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

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Machine Design
Form coefficient of spring is

Ratio of coil diameter to wire diameter
Concerned with strength of wire of spring
Its capability of storing energy
Load required to produce unit deflection

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