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

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

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Machine Design
Stress concentration is caused due to

Abrupt change of section
Pitting at points or areas at which loads on a member are applied
All of these
Variation in properties of material from point to point in a member

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