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

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

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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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