Vibration attenuation of sandwich structures filled with shear thickening fluids

Gürgen, Selim; Sofuoğlu, Mehmet Alper

doi:10.1016/j.compositesb.2020.107831

Cited by 72 publications

(21 citation statements)

References 54 publications

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“…The application of STF in these areas removes the usage of external stimulus like magnetic and electric fields as in the case of MR and ER fluids. [6][7][8][9][10][11][12] The important property of STF is the instantaneous spike in viscosity upon the application of high velocity impact that is, the viscosity of fluid is very high under the sudden applied external load and again regain its original state upon the removal of external load. In the present days, armors utilizing in the current scenario are very bulky, stiffer and not comfortable; therefore, the demand of high performance to weight ratio armors is very high which can be fulfilled by utilizing STF.…”

Section: Magnetorheologicalmentioning

confidence: 99%

Impact behavior of aminosilane functionalized nanosilica based shear thickening fluid impregnated Kevlar fabrics

Katiyar

Nandi

Prasad

2021

J of Applied Polymer Sci

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In the present work, two types of shear thickening fluids have been synthesized by using neat and aminosilane functionalized silica nanoparticles and their viscosity curves have been obtained by the rheometer. Based on the values of peak viscosity of synthesized shear thickening fluids, the surface functionalized nanosilica based shear thickening fluid has been chosen as a best candidate due to the high viscosity for impregnation into the neat Kevlar of different layers viz. four (04) and eight (08) layers for velocity impact study. The experimental investigations reveal high energy absorption of shear thickening fluid impregnated Kevlar as compared to the neat Kevlar. The maximum energy absorption 62 J is achieved corresponding to the initial velocity 154 mÁs −1 for 08 layers shear thickening fluid impregnated Kevlar specimen. The data have also been analytically determined and validated with the experimental data. The experimental data have good agreement with the analytical data within the accuracy of around 15 to 20%. The present findings can have significant inferences towards the fabrication of shear thickening fluids using nanomaterials for numerous applications such as soft armors, dampers, nanofinishing and so forth.

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Section: Magnetorheologicalmentioning

confidence: 99%

Impact behavior of aminosilane functionalized nanosilica based shear thickening fluid impregnated Kevlar fabrics

Katiyar

Nandi

Prasad

2021

J of Applied Polymer Sci

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“…According to previous works [8][9][10][11], STF inclusion in damping systems provides beneficial results in terms of vibration attenuation. In addition, STFs integrating structural members are suggested for mechanical systems subjected to cyclic loadings [12][13][14][15]. STF was also benefitted in manufacturing operations using it as a polishing slurry, which takes advantage of thickening viscosity to hold the abrasive particles in the operation [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Rheological and deformation behavior of natural smart suspensions exhibiting shear thickening properties

Gürgen

Sousa

2020

Archiv.Civ.Mech.Eng

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Shear thickening fluid (STF) is a very interesting and promising material in several application fields where a different mechanical is demanded based on loading rates, like body armor and vibration insulators. Cork is a natural cellular material by excellence, filled with well-known beneficial effects in terms of insulation and also interesting crashworthiness properties. In this work, cork grains of very small size (0.5-1.0 mm) are added to two different shear thickening suspensions, one of them a fully natural water and cornstarch, and the other based on fumed silica and polyethylene glycol. The rheology of these ecofriendly suspensions was investigated and the influences of including cork grains were discussed. In addition, microscopic analyses were carried out to observe the deformations at each component during the shear thickening phenomenon. Cork grains reduce the load-carrying capacity in the suspensions due to the deformable characteristics of cork. For this reason, shear thickening properties are suppressed in the mixtures. Despite this, it is possible to state that viscosity increase in the mixtures leads to strong particle contacts, and thereby resulting in particle deformations in the main constituent powder as well as in the cork additives due to their softer structures.

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“…Shear thickening fluids are used in many fields due to their unique properties mentioned above. Personal body armor [19][20][21], protective clothing [8,22,23], and their use as vibration dampers [24,25] are the most common uses of these fluids. Yarn pull-out, surface friction, impact, and ballistic test of STF impregnated high-performance fabrics will be our future studies.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Most Appropriate Rheological Model for Polyethylene Glycols and Fumed Silica Particle Mixtures

Yanen¹,

Aydoğmuş²,

Solmaz³

2020

MEJS

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Shear thickening fluids are smart materials that show a sudden increase in viscosity when exceeding critical shear rates. Different theories have been proposed to explain these properties of shear thickening. The most used of these theories are Order-Disorder Transition and Hydro-Cluster Theory. Due to their reversible properties, shear thickening fluids have been used in many areas. High molecular weight polyethylene glycols showed faster shear thickening fluids behavior. The molecular weight of polyethylene glycol affects many parameters. These parameters are physical bonds, aggregations of molecular, solid particle interactions, and functional groups in the chain. Due to their effect, rheological behaviors of low and high molecular weight polyethylene glycols differ. The mixtures of polyethylene glycols and fumed silica particles show a colloidal distribution. The distribution of fumed silica particle molecules in polyethylene glycol, interaction with each other restriction, and movement of the bulks have affected rheological properties. Physical interactions are manifested in the structure. The mixture showed non-Newtonian behavior in the first and second regions as well. Rheological behaviors of mixtures were compared with experimental data using non-Newtonian models. Power Law, Bingham, Casson, Herschel-Bulkley, and Sisko model equations were used. Silica particle-PEGs mixtures show pseudo plastic in the first region and dilatant fluid behavior in the second region. In the first region, the Power Law model was determined as the most suitable model for experimental data. In the second region, the Herschel-Bulkley model was found to be the most suitable model that was determined by statistical analysis.

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Vibration attenuation of sandwich structures filled with shear thickening fluids

Cited by 72 publications

References 54 publications

Impact behavior of aminosilane functionalized nanosilica based shear thickening fluid impregnated Kevlar fabrics

Impact behavior of aminosilane functionalized nanosilica based shear thickening fluid impregnated Kevlar fabrics

Rheological and deformation behavior of natural smart suspensions exhibiting shear thickening properties

Determination of the Most Appropriate Rheological Model for Polyethylene Glycols and Fumed Silica Particle Mixtures

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