Parametric sensitivity analysis to maximise auxetic effect of polymeric fibre based helical yarn

McAfee, Jack; Faisal, Nadimul Haque

doi:10.1016/j.compstruct.2016.11.077

Cited by 40 publications

(58 citation statements)

References 22 publications

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“…Heat treatment has also been utilised to solve the issue of slippage [214]. The initial angle at which the wrap fibre is spun around the core fibre, and the diameter ratio of wrap to core fibre influences the value of the NPR, whereby a lower yarn wrap angle increases the magnitude of NPR [215][216][217]. The DHY offers increased energy absorption under impact [209].…”

Section: Fabricating Auxetic Textilesmentioning

confidence: 99%

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Duncan

Shepherd

Moroney³

et al. 2018

Applied Sciences

239

151

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Following high profile, life changing long term mental illnesses and fatalities in sports such as skiing, cricket and American football-sports injuries feature regularly in national and international news. A mismatch between equipment certification tests, user expectations and infield falls and collisions is thought to affect risk perception, increasing the prevalence and severity of injuries. Auxetic foams, structures and textiles have been suggested for application to sporting goods, particularly protective equipment, due to their unique form-fitting deformation and curvature, high energy absorption and high indentation resistance. The purpose of this critical review is to communicate how auxetics could be useful to sports equipment (with a focus on injury prevention), and clearly lay out the steps required to realise their expected benefits. Initial overviews of auxetic materials and sporting protective equipment are followed by a description of common auxetic materials and structures, and how to produce them in foams, textiles and Additively Manufactured structures. Beneficial characteristics, limitations and commercial prospects are discussed, leading to a consideration of possible further work required to realise potential uses (such as in personal protective equipment and highly conformable garments).

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Section: Fabricating Auxetic Textilesmentioning

confidence: 99%

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Duncan

Shepherd

Moroney³

et al. 2018

Applied Sciences

239

151

View full text Add to dashboard Cite

show abstract

“…[20,21,[24][25][26] In contrast, there may also exist an critical angle for obtaining the largest NPR, below or above which the maximum NPR of HAY will be impeded. [22] With respect to the Poisson's ratio of core and stiff yarns, it is found that the auxetic effect of HAY is increased with the decrease in their Poisson's ratio. [24] This is mainly because the decrease in Poisson's ratio of component yarns can reduce the decrease in diameter of the component yarns when stretched, thus magnifying the lateral expansion effect (auxetic effect) of HAY.…”

Section: Introductionmentioning

confidence: 99%

“…This shape deformation could then result in an expansion of HAY in the lateral direction if the diameter of the stiffer fiber is smaller than that of the elastomeric core. [20] According to previous studies, [21][22][23] the lateral shape deformation of HAY can lead to a maximum NPR over À10.0, when certain design configuration is selected. Based on theoretical analyses on HAY, four structural and material parameters, including the initial wrap angle of the stiff yarn, the Poisson's ratio of the core yarn and stiff yarn, relative modulus, and diameter between the core yarn and stiff yarn, are found to have influence on auxetic behavior of HAY.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, an increase in the core/wrap diameter ratio can also enhance auxetic behavior of HAY. [22] However, an elevated difference in component moduli would cause the wrap fiber embedding itself into the core fiber, and thus reducing the auxetic effect of the whole HAY structure. [23] Therefore, careful determination of an optimum core/wrap moduli ratio where the ratio is high enough to yield an auxetic effect and low enough to prevent the core-indentation effect is critical in the real production of HAY.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Modeling on the Deformation Behavior of Auxetic Tubular Braid Made from Modified Circular Braiding Technique

Jiang

Chen

2019

Physica Status Solidi (b)

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Herein, a theoretical analysis of auxetic tubular braid (ATB) formed with three types of component yarns having different diameter and modulus is presented. A simple theoretical model is developed for predicting the deformation behavior of this structure under uniaxial extension. With its accuracy first validated by the experimental data, the developed model is further corrected based on the real condition and thus becomes capable to characterize the auxetic behavior of the ATB. During the analysis, it is found that the stiff wrap yarn cannot be fully straightened in real condition and its helical angle decreasing rate is inconsistent during the stretching. Herein, an effective tool for understanding the deformation behavior is provided, which is meaningful for the braid's improved design and applications.

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“…PR is called auxetics. A negative Poisson’s ratio enables the stiffness and resistance to be actively increased to respond to external stress action loads [ 25 , 26 , 27 , 28 ].

…”

Section: Introductionmentioning

confidence: 99%

Braided Fabrication of a Fiber Bragg Grating Sensor

Lee

2020

Sensors

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Our objective was to construct textile braiding manufacturing methods to facilitate high precision and accurate measurements using optical fiber Bragg grating sensors for various structures. We aimed to combine three-dimensional (3D) braiding processing with the optical Bragg grating sensor’s accurate metrology. Outside the limits of the sensor’s epoxy attachment methods, the textile braiding method can diversify the scope of application. The braiding process can be used to design a 3D fabric module process for multiple objective mechanical fiber arrangements and material characteristics. Optical stress–strain response conditions were explored through the optimization of design elements between the Bragg grating sensor and the braiding. Here, Bragg grating sensors were located 75% away from the fiber center. The sensor core structure was helical with a 1.54 cm pitch, and a polyurethane synthetic yarn was braided together with the sensor using a weaving machine. From the prototype results, a negative Poisson’s ratio resulted in a curled braided Bragg grating sensor. The number of polyurethane strands was studied to determine the role of wrap angle in the braiding. The 12-strands condition showed an increase in double stress–strain response rate at a Poisson’s ratio of 1.3%, and the 16-strands condition was found to have noise affecting the sensor at a Poisson’s ratio of 1.5%. The findings suggested the application of braiding fabrication to the Bragg grating sensor could help to develop a new monitoring sensor.

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Parametric sensitivity analysis to maximise auxetic effect of polymeric fibre based helical yarn

Cited by 40 publications

References 22 publications

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Theoretical Modeling on the Deformation Behavior of Auxetic Tubular Braid Made from Modified Circular Braiding Technique

Braided Fabrication of a Fiber Bragg Grating Sensor

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