It is the property of fibre or material when a Torsional force is applied on it. Here Torsional force is a twisting force that is applied on the two ends of the material in two opposite direction. The behaviors which are shown by a textile material when it is subjected to a torsional force is called torsional property.
1. Torsional rigidity
2. Breaking twist
3. Shear modulus
1. Torsional rigidity:
1. Torsional rigidity:
Torsional rigidity can be defined as the torque required against twisting is done for which torque is termed as torsional rigidity.Mathematically, torsional rigidity = ηET2/ρ
Where,
η = shape factor,
E = specific shear modulus (N/tex)
Specific torsional rigidity: Specific torsional rigidity can be defined as the torsional rigidity of a fiber of unit linear density.Mathematically, specific torsional rigidity = ηE/ρ
Unit: N-m2 /Tex
2. Breaking twist:
The twist for breaking of a yarn is called breaking twist. It also can be defined as the number of twists required to break a yarn. Breaking twist depends on the diameter of fiber and it is inversely proportional to its diameter.That is, Tb ∞ 1/d
Where,
Tb = Breaking twist,
d = diameter of fiber
Breaking twist angle: This is the angle through which outer layer of fiber are sheared at breaking. Mathematically, α = tan-1(πdTb)
Where,
α = breaking twist angle,
d = diameter of fiber,
Tb = breaking twist per unit length
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