Question

When a mild-steel specimen fails in a torsion test fracture looks like

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

For brittle material of low tensile strength and much larger strength in compression and shear the twisting will cause fracture along spiral line at 45° to the axis of cylinder. For ductile material like mild steel, the plane of failure will be normal to the axis.