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

Tightening the bolt properly
Decreasing its shank diameter
Making the shank diameter equal to core diameter of thread
Increasing its shank diameter

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Machine Design
According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by

Equating shearing resistance to the crushing resistance of the rivets
Equating tearing resistance of the plate to the shearing resistance of the rivets
None of these
Equating tearing resistance of the plate to the crushing resistance of the rivets

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