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

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Machine Design
Plastic flow in ductile materials

Depends on other considerations
Lessens the seriousness of static loading stress concentration
Increases the seriousness of static loading stress concentration
Has no effect on it

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