Influence of twist factor on tensile strength and modulus Stress-Strain curve Influence of twist on tensile properties Zylon is shipped with zero twist. A certain twist has to be applied in order to measure its correct tensile strength. These figures show the influence of twist factor on tensile strength and modulus for 500 denier Zylon yarn. For different denier yarns, optimum twist level can be estimated by using twist factor.
Twist factor is defined by the following formula.
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