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Question

The failure surface of a standard cast iron torsion specimen, subjected to a torque is along

A
the surface helicoidal at 45o to the axis of the specimen
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B
the curved surface at the grips
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C
the plane surface perpendicular to the axis of the specimen
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D
the curved surface perpendicular to the axis of the specimen
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Solution

The correct option is A the surface helicoidal at 45o to the axis of the specimen
The cast iron specimen is brittle in nature and therefore the failure surface will be helicoidal at 45o to the axis of the specimen.

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