Machine Design
The design of shafts made of brittle materials is based on

Guest's theory
Von Mises theory
St Venant's theory
Rankine's theory

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

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