Machine Design
The plasticity is the property of a material which enables it to

Regain its original shape after deformation when the external forces are removed
Retain deformation produced under load permanently
Resist fracture due to high impact loads
Draw into wires by the application of a tensile force

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Machine Design
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

The effect of the restraining action of the heads at the end of the pressure vessel is neglected
The tensile stresses are uniformly distributed over the section of the walls
The effect of curvature of the cylinder wall is neglected
All of these

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

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

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