The tensile stress-strain properties of twisted para-aramid fibers have been measured by three experimental procedures: (A) twist at constant length, followed by extension; (B) initial extension, followed by twisting; (C) and twist at constant small tension with contraction, followed by extension. Additionally a fourth procedure of twisting and untwisting was used to examine the act of twisting, not the presence of twist. The strength and breaking extension of aramid fibres decreased at much lower twist factors than nylon and polyester. The contraction on twisting lies between the predictions of two theoretical models.
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