Preparation and properties of fumed silica/Kevlar composite fabrics for application of stab resistant material

Kang, Tae Jin; Hong, Kyung Hwa; Yoo, Mi Ran

doi:10.1007/s12221-010-0719-z

Cited by 119 publications

(80 citation statements)

References 17 publications

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“…In this case the carrier used was a PEG 200 g mol −1 . Results in terms of viscosity change due to thickening effects (two orders of magnitude increase) are not dissimilar to the ones found in literature [25].…”

Section: Rheological Behaviour Of Stf Solutionssupporting

confidence: 63%

Design and Manufacturing of a Novel Shear Thickening Fluid Composite (STFC) with Enhanced out-of-Plane Properties and Damage Suppression

Pinto

Meo

2016

Appl Compos Mater

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The ability to absorb a large amount of energy during an impact event without generating critical damages represents a key feature of new generation composite systems. Indeed, the intrinsic layered nature of composite materials allows the embodiment of specific hybrid plies within the stacking sequence that can be exploited to increase impact resistance and damping of the entire structure without dramatic weight increase. This work is based on the development of an impact-resistant hybrid composite obtained by including a thin layer of Non-Newtonian silica based fluid in a carbon fibres reinforced polymer (CFRP) laminate. This hybrid phase is able to respond to an external solicitation by activating an order-disorder transition that thickens the fluid increasing its viscosity, hence dissipating the energy impact without any critical failure. Several Shear Thickening Fluids (STFs) were manufactured by changing the dimensions of the particles that constitute the disperse phase and their concentrations into the continuous phase. The dynamic viscosity of the different STFs was evaluated via rheometric tests, observing both shear thinning and shear thickening effects depending on the concentration of silica particles. The solutions were then embedded as an active layer within the stacking sequence to manufacture the hybrid CFRP laminates with different embedded STFs. Free vibration tests were carried out in order to assess the damping properties of the different laminates, while low velocity impact tests were used to evaluate their impact properties. Results indicate that the presence of the non-Newtonian fluid is able to absorb up to 45 % of the energy during an impact event for impacts at 2.5 m/s depending on the different concentrations and particles dimensions. These results were confirmed via C-Scan analyses to assess the extent of the internal delamination.

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Section: Rheological Behaviour Of Stf Solutionssupporting

confidence: 63%

Design and Manufacturing of a Novel Shear Thickening Fluid Composite (STFC) with Enhanced out-of-Plane Properties and Damage Suppression

Pinto

Meo

2016

Appl Compos Mater

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“…Shear-thickening behavior refers to a non-Newtonian fluid phenomenon, i.e., the viscosity increases with the shear strain rate. This behavior is frequently observed in dense suspensions [29][30][31];…”

Section: Introductionmentioning

confidence: 79%

“…The extent of STF impregnation was observed after drying using a field-emission scanning electron microscopy (FE-SEM) (JSM7600F, JEOL) up to 3,000 × magnification. The magnifications up to 3,000 × were determined considering the size of fibers and impregnated STF clusters, referring to previous literatures [26,31].…”

Section: Methodsmentioning

confidence: 99%

Shear behavior of a shear thickening fluid-impregnated aramid fabrics at high shear rate

Ahn

Han

et al. 2016

Composites Part B: Engineering

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Shear-thickening fluid-impregnated aramid (STF-im-AR) fabrics have been manufactured for advanced soft body armor applications for which they provide improved ballistic and stab resistances. It is not yet clear whether or not such improvements can be attributed solely to the STF. In this study, the rate-dependent behavior of an STF-im-AR fabric was investigated at the fabric level, using uniaxial tensile, bias-extension, and picture-frame tests. Rate-dependent behavior of the STF-im-AR fabric was observed during uniaxial tensile testing; however, the effect of the STF treatment was slight and consistent with only the inherent effect of the polymeric nature of its constituent fibers. The shear rigidity of the STF-im-AR fabric increased, due to the presence of the STF and the sensitivity of the fabric's shear stiffness to changes in the shear strain rate also increased slightly. This rate-sensitive shear stiffness of STF-im-AR fabrics may contribute to improved ballistic and stab resistances.

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“…The role of the STF in the STF-treated fabrics was not mentioned, and the quantity of the absorbed STF in the fabrics was also ignored in this study. 33 Kalman et al reported that stab resistance and ballistic resistance were enhanced for STF-Kevlar composites that absorbed 9 wt% to 14 wt% STF. 23,34 Majumdar found that the silica concentration, padding pressure and square of solvent ratio were the statistically signicant terms inuencing the impact energy absorption.…”

Section: -30mentioning

confidence: 99%

Dynamic/quasi-static stab-resistance and mechanical properties of soft body armour composites constructed from Kevlar fabrics and shear thickening fluids

et al. 2017

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Soft body armour composites were constructed by combining Kevlar fabrics with different quantities of shear thickening fluid (STF). In particular, the quantity of the added STF and the mechanical properties of these composites were systemically explored. The dynamic and quasi-static knife-stabbing resistance and the quasi-static mechanical properties of these composites were both significantly enhanced in comparison to those of neat Kevlar fabric. The composites were much lighter, thinner and more flexible than the neat Kevlar fabric and, with an optimal quantity of added STF, could not even be penetrated. However, the dynamic knife-stabbing resistance of the fabric became poor when the amount of added STF was higher than 100 wt%. The tensile strength of the composites could be increased from 40% to 80% and the tearing strength could be increased by nearly eight times that of the neat Kevlar fabric by increasing the concentration of added STF. Yarn pull-out testing suggested that the triggered shear thickening contributed to the increase of the friction between yarns or filaments, resulting in improvements in the dynamic and quasi-static properties of these composites. Moreover, these composites are suitable for use as soft body armour materials due to their good adaptability to high and low speeds conditions.

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Preparation and properties of fumed silica/Kevlar composite fabrics for application of stab resistant material

Cited by 119 publications

References 17 publications

Design and Manufacturing of a Novel Shear Thickening Fluid Composite (STFC) with Enhanced out-of-Plane Properties and Damage Suppression

Design and Manufacturing of a Novel Shear Thickening Fluid Composite (STFC) with Enhanced out-of-Plane Properties and Damage Suppression

Shear behavior of a shear thickening fluid-impregnated aramid fabrics at high shear rate

Dynamic/quasi-static stab-resistance and mechanical properties of soft body armour composites constructed from Kevlar fabrics and shear thickening fluids

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