Optimizing the ethanol content of shear thickening fluid/fabric composites under impact loading

Kordani, Naser; Vanini, Ali Sadough

doi:10.1007/s12206-013-1130-7

Cited by 26 publications

(15 citation statements)

References 10 publications

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“…Comparing the yarn pull-out force values indicates that the STF-treated samples have the highest value and is approximately three times higher than that of the neat sample. Kordani, et al [48] conducted high velocity impact experiment to STF-Kevlar fabrics and demonstrated that adding STF to Kevlar fabric can slightly improve impact resistance. They showed that increasing the ethanol ratio in the samples reduces the final viscosity and shortens the stability and transition of shear thickening at a high strain rate.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Ballistic performance of Kevlar fabric impregnated with nanosilica/PEG shear thickening fluid

Khodadadi

Liaghat

Vahid

et al. 2019

Composites Part B: Engineering

140

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This study presents the response of fiber reinforced composite material composed of woven Kevlar fabric impregnated with a colloidal shear thickening fluid (STF) under high velocity impact loading. The STF was made by dispersing silica nanoparticles at 15, 25, 35 and 45 wt.% loading in polyethylene glycol. The effects of silica nanoparticle loading on energy absorption and ballistic limit were studied experimentally. Rheological results revealed that shear thickening occurred at all four nanosilica loading and higher loading showing the higher shear thickening at lower shear rate. SEM images confirmed good dispersion of nanosilica particles in the suspension. The results of the pull out test show that by increasing nanosilica loading, the force required to pull the yarn out from the fabric impregnated by STF increases. Impact resistance performance of Kevlar fabric is significantly enhanced due to the presence of STF. Although high velocity impact results show that by increasing nanosilica loading, the energy absorption of composites increases, but in high loading of nanosilica, the effectiveness of STF decreases. For further investigation, the energy absorption at the ballistic limit was normalized by the areal density of the neat and impregnated fabrics to give the specific energy absorption (SEA). It is found that the SEA of 15 wt.% nanosilica loading is lower compared to the neat fabric. Also the highest SEA turn out in the case of 35 wt.% STF/Kevlar composites in which the SEA is 2.3 times larger than those of the neat fabric.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Ballistic performance of Kevlar fabric impregnated with nanosilica/PEG shear thickening fluid

Khodadadi

Liaghat

Vahid

et al. 2019

Composites Part B: Engineering

140

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“…The last method is combination of mechanical and ultrasonic technique. It can be done either doing mechanical mixing followed by irradiation by ultrasonic horn as practiced by Kordani and Vanini [22] as Fig. 3 or can be done simultaneously.…”

Section: Shear Thickening Fluids (Stf)mentioning

confidence: 99%

“…7. The critical shear rate for finer particle size can be brought down by increasing the weight fraction, but there has a limitation of percentages weight fraction can be done since the higher concentration tends to forms cluster [22]. Feng et al [34] used two type of silica with different particle sizes 100nm and 500nm for STF composition (namely STF1 and STF2) and conducting quasi-static stab test.…”

Section: B Particle Sizementioning

confidence: 99%

A Review on Stab and Spike Resistance Performance of Shear Thickening Fluids (STF) Impregnated Fabrics

2017

May 22-24, 2017 Kuala Lumpur (Malaysia) ICLTET-2017, ACBES-2017

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Abstract-This paper provides a brief review on relevant literature related to shear thickening fluids (STF) impregnated fabrics on stab and spike resistance performance. Soft body armours consist of multiple layers of high performance fabric to stop stab and spike threats. To reduce the number of fabric layers on soft body armours, STF has been introduced. STF transforms from liquid state to a solidlike state under applied stress and return to its original state after stress is removed. Hence, several studies were conducted to enhance the stab and spike resistance of fabrics by exploiting STF unique properties. The performance of STF-fabric that affected by several factors, such as fibre properties, fabric architectures, STF rheological properties (particles size, shape and solid volume fraction), STF synthesis and impregnation process will be reviewed in this paper.

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“…STF formation was achieved by dispersing the particles of SiO 2 , CS and mixture of SiO 2 and SiC in ethylene glycol according to the study of Petel et al [3]. The general procedure for the impregnation of STF to woven fabrics involves placing woven fibres in STF for 1 min followed by the dilution of STF by ethanol [25,28]. Then, the specimens were settled in oven for drying at 80 • C for 20 min [28].…”

Section: Introductionmentioning

confidence: 99%

Rheological behaviours of silica/water, silica/PEG systems and mechanical properties of shear thickening fluid impregnated Kevlar composites

Güler

2018

Bull Mater Sci

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Evolution in armour materials is critical to improve the protection abilities together with the properties of flexibility and lightness. Silica colloidal suspensions are important candidates to improve strength of the armour materials. The dispersing medium of the silica particles acts as an important role in the formation of shear thickening fluids (STF). STF has the ability to have increased viscosity by increasing the shear rate. Rheological, impact, flexibility and yarn pull-out tests were performed during the study. This study demonstrated that STF did not occur in the case of dispersing silica in water, but increased the impact resistance when Kevlar treated by the silica dispersed in water as compared to neat Kevlar. Fumed silica distribution in polyethylene glycol (PEG) led to STF creation confirmed by the rheological tests. The impact resistance of STF-treated Kevlar was found to be improved when compared to silica-dispersed water-impregnated Kevlar. It was observed that the pull-out force values of STF-fertilized Kevlar were increased compared to neat Kevlar.

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Optimizing the ethanol content of shear thickening fluid/fabric composites under impact loading

Cited by 26 publications

References 10 publications

Ballistic performance of Kevlar fabric impregnated with nanosilica/PEG shear thickening fluid

Ballistic performance of Kevlar fabric impregnated with nanosilica/PEG shear thickening fluid

A Review on Stab and Spike Resistance Performance of Shear Thickening Fluids (STF) Impregnated Fabrics

Rheological behaviours of silica/water, silica/PEG systems and mechanical properties of shear thickening fluid impregnated Kevlar composites

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