Machine Design
The objective of caulking in a riveted joint is to make the joint

Free from stress
Stronger in tension
Free from corrosion
Leak-proof

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Machine Design
In case of thick cylinders, the tangential stress across the thickness of cylinder is

Maximum at the outer surface and zero at the inner surface
Maximum at the inner surface and minimum at the outer surface
Maximum at the outer surface and minimum at the inner surface
Maximum at the inner surface and zero at the outer surface

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