Machine Design
Stress concentration is caused due to

Abrupt change of section
Pitting at points or areas at which loads on a member are applied
Variation in properties of material from point to point in a member
All of these

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

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

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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 outer surface and zero at the inner 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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