Effects of Kevlar® 29 yarn twist on tensile and tribological properties of self-lubricating fabric liner

Abstract

Yarn twist in textile technology is an important characteristic since it considerably affects the properties of knitted or woven fabrics. Many researchers have investigated the effect of staple-spun yarn twist on the properties yarn and fabric. However, the effects of twist level of Kevlar® 29 (K29) filament yarn on the properties of yarn and its resin-impregnated self-lubricating fabric liner are not fully known yet. In this study, we have investigated the effects of K29 twist level on the tensile and tribological properties of the fabric liner (K29/PTFE fabric-resin composite). Two unexpected findings about the effect of yarn twist have been observed, namely 1) asynchronous twist effect on the yarn's and the liner's tensile strength and 2) dissimilar yarn twist effect on the liner's performance. These findings are mainly attributed to the synergic contributions of the yarn twist and strength and the interaction of the resin with the yarn orientation in the woven fabric structure of the liner.

Influence of fabric geometry on yarn pull‐out property and wear performance of hybrid S‐glass/PTFE fabric‐reinforced composites

“…23 The twist effect on tensile and tribological properties of fabric liner were investigated and the optimum yarn twist levels for tribology performance of liner appear to 150 to 180 twists per 10 cm and 120 twists per 10 cm for adhesive strength. 24,25 Although several fabric structures and corresponding composites were researched, the effect of fabric structure on inter-yarn friction in fabric and tribological properties of fabric-reinforced composite have not been studied. The literature reveals that inter-yarn friction affect the energy dissipation in fabric when those yarn begin displace relative to another, whether through yarn sliding, pull-out, or re-orientation.…”

“…The tribological performance of hybrid Kevlar/PTFE fabric composites reinforced with plain, twill 1/3, satin 8/5 structure was studied, and the results showed the tribological performance of fabric‐reinforced composite was affected by the different PTFE proportions in the fabric and different wear mechanisms 23 . The twist effect on tensile and tribological properties of fabric liner were investigated and the optimum yarn twist levels for tribology performance of liner appear to 150 to 180 twists per 10 cm and 120 twists per 10 cm for adhesive strength 24,25 …”

Study on the wearability and abrasion mechanism of braided harness cord

“…However, they did not conduct intensive experimental research on this property. In the field of yarn and rope, which is similar to harness cord, researchers investigated the influence of apparatus factors, 15,16 material parameters, 17–19 and environmental conditions 20–22 on the wearability using the self-made test device, the existing apparatus or the improved ones. 23,24 Most of the works used the abrasive times as the parameter to evaluate the wearability, whereas Black 25 estimated the wearability by the residual strength of worn high modulus polyethylene rope.…”

On composite materials response subjected to impact loading

“…Figure 2-24 illustrates the yarn fattening caused by filament redistribution after impact loading [66]. Furthermore, it should be mentioned that the yarn twist in textile technology is an important factor since it significantly affects the mechanical response of yarns [67]. Twisting produces mechanical binding between yarn fibers.…”

“…Literature data provides that twist effect is the major factor for the variation of material properties of yarns. In particular, J.Ma et al [67] have investigated the effects of Kevlar 29 yarn twist on tensile properties. They proved that slight twisting can be beneficial to improve elastic modulus and yarn strength, but over twisting is harmful to the fibers.…”