Machine Design
Spring index is

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

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Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Have variable bending moment (M) in each leaf
Permit each leaf to act as an overhanging beam
Obtain variable moment of inertia (I) in each leaf
Make M/I constant throughout the length of the leaf

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