Machine Design
Spring index is

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

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

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

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