A) Torsional rigidity, Breaking twist, Shear modulus, Breaking twist angle

B) Breaking twist is the twist for which a textile fiber will break. Breaking twist can also be defined as the number of turns or twists required to break a fiber. Breaking twist depends upon the diameter of fiber and is inversely proportional to the diameter.

So, Breaking twist, Tb ∞1/d

Where, Tb = Breaking twist,

d = diameter of fiber.