Machine Design
Form coefficient of spring is

Concerned with strength of wire 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

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

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