Machine Design
Coaxing is the procedure of increasing

Metal hardness by surface treatment
Fatigue limit by over-stressing the metal by successively increasing loadings
Metal strength by cycling
Metal resistance to corrosion by coating

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Machine Design
According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of 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
Equating tearing resistance of the plate to the crushing resistance of the rivets
None of these

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