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
Obtain variable moment of inertia (I) in each leaf
Have variable bending moment (M) in each leaf
Make M/I constant throughout the length of the leaf

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

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

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