This report, continued from the previous report No. IV, deals also with the breaking strength of a yarn. Supposing that a yarn is cut due to slipping-out of all fibers, the breaking strength of a yarn
PR can be calculated in the following formula.
PR=
Po{(1+
μl' cot
2βo/
Ro)+φ.25
κtμl' cot
2βo/
Ro Wo}
where P
o : Breaking strength of the cut-materials
Ro : Radius at the beginning of twist
βo Pitch angle at the beginning of twist
t : Thickness of the cut-materials
μ : Friction-coefficient
l' : Length of the fiber-element
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