Mechanism of Yarn Failure

Broughton, R. M.; Mogahzy, Y.E. El; Hall, David

doi:10.1177/004051759206200302

Cited by 42 publications

(19 citation statements)

References 3 publications

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“…In terms of CNT fibres there are two extreme scenarios: one for high inter-filament friction, where the nanotube tensile strength would determine the yarn strength, and yarn-like properties such as the reported knot efficiency of 100% [4] would be lost and traded for brittleness, and the other for very low inter-filament friction, where the yarn might be viewed as formed from a lubricant material, and one would hardly expect it to be strong. In yarn science, the control of friction is a key objective [5], so we review here what is known about friction forces between CNT layers.…”

Section: Yarn Sciencementioning

confidence: 99%

Mechanical properties of carbon nanotube fibres: St Venant’s principle at the limit and the role of imperfections

Gspann

Montinaro

Pantano

et al. 2015

Carbon

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Carbon nanotube (CNT) fibres, especially if perfect in terms of their purity and alignment,\ud are extremely anisotropic. With their high axial strength but ready slippage between the\ud CNTs, there is utmost difficulty in transferring uniformly any applied force. Finite element\ud analysis is used to predict the stress distribution in CNT fibres loaded by grips attached to\ud their surface, along with the resulting tensile stress–strain curves. This study demonstrates\ud that, in accordance with St Venant’s principle, very considerable length-to-diameter ratios\ud (103) are required before the stress becomes uniform across the fibre, even at low strains.\ud It is proposed that lack of perfect orientation and presence of carbonaceous material\ud between bundles greatly enhances the stress transfer, thus increasing the load the fibre\ud can carry before failing by shear. It is suggested that a very high strength batch of fibres previously\ud observed experimentally had an unusually high concentration of internal particles,\ud meaning that the pressure exerted by the grips would assist stress transfer between the\ud layers. We conclude that the strength of CNT fibres depends on the specific testing geometries\ud and that imperfections, whether by virtue of less-than-perfect orientation or of\ud embedded impurities, can act as major positive contributors to the observed strength

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Section: Yarn Sciencementioning

confidence: 99%

Mechanical properties of carbon nanotube fibres: St Venant’s principle at the limit and the role of imperfections

Gspann

Montinaro

Pantano

et al. 2015

Carbon

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“…He considered the fact that blended yarns have breaking strengths that are lower than those expected from the summation of the proportioned constituent fibre component strengths. The tensile failure of blended yarn reported in the literature is concerned with tensile characterization (Broughton, Mogahzy, & Hall, 1992;Cybulska, Goswami, & MacAlister, 2001;Hearle & Wong, 1977), mathematical models to explain tensile properties and the hybrid effect (Pan, 1992(Pan, , 1996Pan, Chen, Monego, & Backer, 2000;Rossettos & Godfrey, 2002 and change in yarn diameter during failure and failure zone length (Lizàk, 2002;Slodowy & Rutkowska, 2004). Despite plethora of works, the tensile failure of blended yarns in relation to diverse yarn structures produced from different spinning systems is unexplored.…”

Section: Introductionmentioning

confidence: 99%

Influence of fibre strength and yarn structural characteristics on tensile failure of blended spun yarns: a prediction model

Ishtiaque¹,

Rengasamy²,

Sharma³

et al. 2015

The Journal of The Textile Institute

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The study reports on the static failure behaviour of P/V blended ring, rotor and air-jet spun yarns explained on the basis of fibre failure coefficient. Fibre failure coefficient is an index introduced to represent fibre break and slip in combination occurring during tensile failure. Fibre break/slip during tensile failure is found dependent on fibre strength, fibre cohesiveness and internal structural developments in yarns. Tensile failure behaviour of ring, rotor and air-jet yarns found to be different owing to their difference in fibre consolidation mechanism. The contribution of individual components towards fibre failure coefficient varies with the spinning technology. An attempt has been made to develop mathematical models to explain the spun yarn failure behaviour under static condition. The developed mathematical models have incorporated the fibre property (fibre strength) and few structural characteristics of yarns which are strategically selected to justify the essence of models to enhance the prediction capability. Individual models are developed for ring, rotor and air-jet yarns owing to their structural changes caused by their inherent fibre consolidation mechanism. The developed mathematical models are free from assumptions and based on pure applied mathematics and have very high potential for prediction of spun yarn failure behaviour.

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“…The better the fineness of cotton, the more fibres there are per cross-section resulting in higher yarn strength. Broughton et al (1992) acknowledged that increasing fibre length results in improved yarn strength because a long fibre generates a greater frictional resistance to an external force. Broughton et al (1992) stated that at high fibre length, the tensile strength of the fibres becomes the controlling factor of yarn strength.…”

Section: Introductionmentioning

confidence: 99%

An update on conventional and molecular breeding approaches for improving fiber quality traits in cotton - A review

Ashokkumar¹,

Kumar²,

Ravikesavan³

2014

Afr. J. Biotechnol.

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The cultivated Gossypium spp. represents the most important, natural fibre crop in the world. India is the only country cultivating all the four cultivated species of cotton. Among the Gossypium spp., Gossypium hirsutum is the most cultivated species in many countries. Breeding for high cotton yield is still the primary goal of cotton breeding programs, but improving fibre quality has become increasingly important. The enhancement of fibre quality traits like fibre length, strength, and fibre fineness is an essential requirement for the modern textile industry. G. hirsutum is characterized by its high lint yield while Gossypium barbadense has good fibre quality. Through a conventional breeding strategy, introgression of useful alleles for fibre quality from wild species and G. barbadense to G. hirsutum will be the effective way to improve the fibre quality traits. The identification of the stable quantitative trailt loci (QTLs) affecting fiber traits across different generations will be very helpful in molecular markerassisted selection to improve fiber quality of cotton cultivars. In this review, we present an overview of the genetics and conventional and molecular breeding techniques that have been used to increase the favorable fibre quality traits in cotton.

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Mechanism of Yarn Failure

Cited by 42 publications

References 3 publications

Mechanical properties of carbon nanotube fibres: St Venant’s principle at the limit and the role of imperfections

Mechanical properties of carbon nanotube fibres: St Venant’s principle at the limit and the role of imperfections

Influence of fibre strength and yarn structural characteristics on tensile failure of blended spun yarns: a prediction model

An update on conventional and molecular breeding approaches for improving fiber quality traits in cotton - A review

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