Question

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

• A. the surface helicoidal at ${45}^o$ to the axis of the specimen
• B. the curved surface at the grips
• C. the plane surface perpendicular to the axis of the specimen
• D. the curved surface perpendicular to the axis of the specimen

Answer 1

The correct option is A the surface helicoidal at ${45}^o$ to the axis of the specimen

The cast iron specimen is brittle in nature and therefore the failure surface will be helicoidal at ${45}^o$ to the axis of the specimen.