Machine Design
The shock absorbing capacity of a bolt can be increased by

Increasing shank diameter
Making shank diameter equal to core diameter of thread
Tightening it properly
Grinding the shank

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

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