Machine Design
Spring index is

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

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Machine Design
Form coefficient of spring is

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

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Machine Design
Plastic flow in ductile materials

Depends on other considerations
Has no effect on it
Increases the seriousness of static loading stress concentration
Lessens the seriousness of static loading stress concentration

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