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Strength of Materials

Mohr's Circle for Stress

What would be...

Question

What would be the shape of the failure surface of a standard cast iron specimen subjected to torque?

A

Cup and cone shape at the centre

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B

Plane surface perpendicular to the axis of the specimen

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C

Pyramid type wedge-shaped surface perpendicular to the axis of the specimen.

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D

Helicoidal surface at 45° to the axis of the specimen.

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Solution

The correct option is D Helicoidal surface at 45° to the axis of the specimen.
Brittle materials fail in a plane at 45° from the axis when subjected to torque because they are weak in tension compare to shear. If ductile materials are subjected to torque, then the failure surface will be in a plane at 90° from the axis of shaft.

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