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

Plane surface perpendicular to the axis of specimen

Pyramid type wedge – shaped surface perpendicular to the axis of specimen

Helicoid surface at 45° to the axis of specimen

For a material what would be the shape of the failure surface of stand

1.	For a material what would be the shape of the failure surface of standard cast iron specimen subjected to torque?
A.	Cup and cone
B.	Plane surface perpendicular to the axis of specimen
C.	Pyramid type wedge – shaped surface perpendicular to the axis of specimen
D.	Helicoid surface at 45° to the axis of specimen
Answer» E.