Investigating the quasi-static puncture resistance of p-aramid nanocomposite impregnated with the shear thickening fluid

2014 ◽  
Vol 33 (22) ◽  
pp. 2064-2072 ◽  
Author(s):  
Hamid Reza Baharvandi ◽  
Peiman Khaksari ◽  
Morteza Alebouyeh ◽  
Masoud Alizadeh ◽  
Jalal Khojasteh ◽  
...  
Keyword(s):  
Particle Size ◽  
Shear Thickening ◽  
Mechanical Mixing ◽  
Shear Thickening Fluid ◽  
Puncture Resistance ◽  
Viscosity Increase ◽  
Fluid Concentration ◽  
Shear Thickening Fluids ◽  
The Difference ◽  
American Society

The effect of impregnating p-aramid fabrics with shear thickening fluids on their quasi-static puncture resistance performance has been investigated. To prepare the shear thickening fluid, 12 and 60-nm silica particles have been dispersed in polyethylene glycol by means of mechanical mixing. The results of rheological tests indicate that the reduction of particle size leads to the increase of suspension viscosity, increase of critical shear rate, and the diminishing of the frequency of transition to elastic state for the shear thickening fluids. Samples of p-aramid impregnated fabrics were subjected to the quasi-static puncture resistance test according to the American Society for Testing and Materials standard D6264. The quasi-static puncture resistance increased 4.5 times for samples with 35 wt% silica concentration relative to the neat sample. In particular, with the reduction of particle size, the samples undergo less deformation and can withstand larger loads at each shear thickening fluid concentration. However, at low and medium concentrations (15 and 25 wt%), the reduction in the particle size has a large effect on the load-bearing capacity of the fabrics. But in the case of 35 wt% concentration for both the 12- and 60-nm particles, the difference between maximum loads withstood by the fabric is negligible.

The Ballistic Performance of Multi-Layer Kevlar Fabrics Impregnated with Shear Thickening Fluids

2015 ◽  
Vol 782 ◽  
pp. 153-157 ◽  
Author(s):  
Yan Wang ◽  
Shu Kui Li ◽  
Xin Ya Feng
Keyword(s):  
Particle Size ◽  
Coupling Effect ◽  
Shear Thickening ◽  
Silica Particles ◽  
Ballistic Performance ◽  
Shear Thickening Fluid ◽  
Aramid Fabric ◽  
Shear Thickening Fluids ◽  
Ballistic Properties ◽  
Ballistic Test

This study investigates the ballistic penetration performance of aramid fabric impregnated with shear thickening fluid. The ballistic test was conducted at impact velocity of 445 m/s, and three types of shear thickening fluids prepared with silica particles of different sizes (200nm, 340nm and 480nm) are involved. The results demonstrate an enhancement in ballistic properties of fabric due to the impregnation of shear thickening fluids. The fabrics with smaller particle size show better ballistic performance. Microscopic observation of aramid fabric reveals that shear thickening fluids with smaller silica particles have a better adhesion on and between yarns, enhancinging the coupling effect between yarns. The corresponding mechanism was discussed in the paper.

scholarly journals Modification and integration of shear thickening fluids into high performance fabrics

2021 ◽  
Author(s):  
Jakub Mikolaj Szczepanski
Keyword(s):  
High Performance ◽  
Chemical Properties ◽  
Shear Thickening ◽  
Innovative Technology ◽  
Chemical Compositions ◽  
Shear Thickening Fluid ◽  
Puncture Resistance ◽  
Body Armour ◽  
Shear Thickening Fluids ◽  
Stab Resistance

Great interest has aroused in developing the next generation body armour based on the incorporation of a Shear Thickening Fluid (STF) into high performance fabrics (Kevlar®, UHMWPE). This innovative technoloy allows for the production of comfortable, flexible, lightweight, stab and ballistic resistant protective garments. This innovative technology allows for the production of comfortable, flexible, lightweight, stab and ballistic resistant protective garments. The furrent research was undertaken to evaluate the stab resistance and the chemical properties of types of high performance fabrics, Kevlar and Ultra Hight Molecular Weight Polyethylene (UHMWPE), impregnated with several types of shear thickening fluids. The stab resistance properties of all samples were tested using drop tower and quasistatic testing apparatuses. Chemical compositions and microscopic structures were analyzed with Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy and Energy Dispersive Spectroscopy. The current study demonstrated the importance of incorporating Shear Thickening Fluid into woven high performance fibres. The results clearly display a significant enhancement in puncture resistance ony of Kevlar® fabrics impregnated with different combination of STFs.

scholarly journals Effect of particle size of fumed silica on the puncture resistance of fabrics impregnated with shear thickening fluid

2021 ◽  
Vol 16 ◽  
pp. 155892502110613
Author(s):  
Zhenqian Lu ◽  
Zishun Yuan ◽  
Jiawen Qiu
Keyword(s):  
Particle Size ◽  
Fumed Silica ◽  
Shear Thickening ◽  
Weight Fraction ◽  
Areal Density ◽  
Woven Fabrics ◽  
Body Armor ◽  
Shear Thickening Fluid ◽  
Puncture Resistance ◽  
Effect Of Particle Size

This paper presents an investigation into the effect of particle size of fumed silica on the puncture resistance of fabric impregnated with shear thickening fluid (STF). Two different types of STF were fabricated from fumed silica nanoparticles with particle sizes of 12 and 40 nm respectively. The effects of the particle size and weight fraction of the fumed silica on the rheological property were studied. STFs impregnated woven fabrics were fabricated and tested for stabbing resistance. STFs made of fumed silica with large particle size have better shear thickening effect. The stabbing resistant performance of STF impregnated fabrics improved notably with the same number of layers of fabric, and STFs impregnated fabric panels also outperform the untreated fabric panels with the same areal density. The results indicated that STFs made of fumed silica with larger particle size is able to fabricate a lighter soft body armor with higher stabbing protection.

scholarly journals Modification and integration of shear thickening fluids into high performance fabrics

2021 ◽  
Author(s):  
Jakub Mikolaj Szczepanski
Keyword(s):  
High Performance ◽  
Chemical Properties ◽  
Shear Thickening ◽  
Innovative Technology ◽  
Chemical Compositions ◽  
Shear Thickening Fluid ◽  
Puncture Resistance ◽  
Body Armour ◽  
Shear Thickening Fluids ◽  
Stab Resistance

Great interest has aroused in developing the next generation body armour based on the incorporation of a Shear Thickening Fluid (STF) into high performance fabrics (Kevlar®, UHMWPE). This innovative technoloy allows for the production of comfortable, flexible, lightweight, stab and ballistic resistant protective garments. This innovative technology allows for the production of comfortable, flexible, lightweight, stab and ballistic resistant protective garments. The furrent research was undertaken to evaluate the stab resistance and the chemical properties of types of high performance fabrics, Kevlar and Ultra Hight Molecular Weight Polyethylene (UHMWPE), impregnated with several types of shear thickening fluids. The stab resistance properties of all samples were tested using drop tower and quasistatic testing apparatuses. Chemical compositions and microscopic structures were analyzed with Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy and Energy Dispersive Spectroscopy. The current study demonstrated the importance of incorporating Shear Thickening Fluid into woven high performance fibres. The results clearly display a significant enhancement in puncture resistance ony of Kevlar® fabrics impregnated with different combination of STFs.

Dynamic compressive response of 3D GFRP composites with shear thickening fluid (STF) matrix as cushioning materials

2021 ◽  
pp. 002199832098424
Author(s):  
Mohsen Jeddi ◽  
Mojtaba Yazdani
Keyword(s):  
Shear Thickening ◽  
Low Velocity Impact ◽  
Gfrp Composites ◽  
High Concentration ◽  
Low Velocity ◽  
Shear Thickening Fluid ◽  
Compressive Response ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Shear Thickening Fluids

Whereas most previous studies have focused on improving the penetration resistance of Shear Thickening Fluids (STFs) treated composites, in this study, the dynamic compressive response of single and multi-ply 3 D E-Glass Fiber Reinforced Polymer (GFRP) composites with the STF matrix was investigated by using a drop-weight low-velocity impact test. The experimental results revealed the STF improved the compressive and cushioning performance of the composites such that with increasing its concentration, further improvement was observed. The five-ply composite containing the STF of 30 wt% silica nanoparticles and 1 wt% carbon nanotubes (CNTs) reduced the applied peak force by 56% and 26% compared to a steel plate and five-ply neat samples, respectively. A series of repeated impacts was performed, and it was found that the performance of high-concentration composites is further decreased under this type of loading.

Influence of Components on the Rheological Property of Shear Thickening Polishing Slurry

2016 ◽  
Vol 1136 ◽  
pp. 461-465
Author(s):  
Bing Hai Lyu ◽  
Wei Tao Dai ◽  
Hai Zhou Weng ◽  
Min Li ◽  
Qian Fa Deng ◽  
...  
Keyword(s):  
Particle Size ◽  
Shear Rate ◽  
Rheological Property ◽  
Base Fluid ◽  
Abrasive Particle ◽  
Weight Ratio ◽  
Shear Thickening ◽  
Key Factors ◽  
Shear Thickening Fluid ◽  
High Efficient

Shear thickening polishing (STP) method was newly developed to achieve high efficient and high quality finishing of complex curved surface. The shear thickening fluid based slurry is one of the key factors in STP process. Viscosity of different shear thickening polishing slurry (STPS) was tested by rheometer in this study. The influences of dispersed particle size and concentration, abrasive material, abrasive particle size and concentration on the rheological property of STPS were analyzed. The results show that smaller dispersed particle (5.5 or 13μm in this study) and relative higher concentration (50-55 wt.%) are better for shear thickening effect of the base fluid. The viscosity of base fluid increases from 0.15-0.3 Pa·s to 0.8-1.1 Pa·s under high shear rate. The participation of Al2O3 and diamond abrasive changes the rheological property little, and the viscosity of STPS reaches the highest value 1.8 Pa·s at shear rate 300 s-1. But SiC abrasive obviously destroys the shear thickening effect. SPTS with different Al2O3 abrasive concentration in this study presents almost same viscosity curve. It is inferred that the number of the abrasive particle but not the weight ratio plays the role to effect the rheological property of STPS.

An Electromechanical In Situ Viscosity Measurement Technique for Shear Thickening Fluids

2021 ◽  
Vol 43 ◽  
pp. 33-43
Author(s):  
Gökhan Haydarlar ◽  
Mehmet Alper Sofuoğlu ◽  
Selim Gürgen ◽  
Melih Cemal Kushan ◽  
Mesut Tekkalmaz
Keyword(s):  
Measurement Technique ◽  
Low Cost ◽  
Spectral Response ◽  
Shear Thickening ◽  
Viscosity Measurement ◽  
Rheological Parameters ◽  
Shear Thickening Fluid ◽  
Electromechanical Impedance ◽  
Shear Thickening Fluids

This paper presents the feasibility of developing an electromechanical in-situ viscosity measurement technique by analyzing the detectability of small variations in the viscosity of different shear thickening fluids and their different compositions. Shear thickening fluid (STF) is a kind of non-Newtonian fluid showing an increasing viscosity profile under loading. STF is utilized in several applications to take advantage of its tunable rheology. However, process control in different STF applications requires rheological measurements, which cause a costly investment and long-lasting labor. Therefore, one of the most commonly used in-situ structural health monitoring techniques, electromechanical impedance (EMI), was used in this study. In order to actuate the medium electromechanically, a piezoelectric wafer active sensor (PWAS) was used. The variations in the spectral response of PWAS resonator that can be submerged into shear thickening fluid are analyzed by the root mean square deviation, mean absolute percentage deviation and correlation coefficient deviation. According to the results, EMI metrics provide good correlations with the rheological parameters of STF and thereby enabling quick and low-cost rheological control for STF applications such as vibration dampers or stiffness control systems.

scholarly journals Rheology of Fumed Silica and Polyethylene Glycol Shear Thickening Suspension with Nanoclay as an Additive

2019 ◽  
Vol 69 (4) ◽  
pp. 402-408 ◽  
Author(s):  
Mansi Singh ◽  
Sanjeev K Verma ◽  
Ipsita Biswas ◽  
Rajeev Mehta
Keyword(s):  
Steady State ◽  
Polyethylene Glycol ◽  
Fumed Silica ◽  
Shear Thickening ◽  
Dynamic State ◽  
Shear Thickening Fluid ◽  
Organically Modified ◽  
The Difference ◽  
Critical Viscosity ◽  
Stability And Consistency

Shear thickening properties of fumed silica-polyethylene glycol (PEG) with shear thickening fluid (STF) of different concentrations and with an organically modified clay, Nanomer I.28 E as nano-additive have been investigated by both steady-state and dynamic state rheology. Difference in rheology if instead of nanoclay, an equal wt% of additional fumed silica is added to 20 per cent fumed silica-PEG200 STF, has been studied. At 25 °C, in case of addition of nanoclay the increase in critical viscosity is less than that observed for same additional amount of fumed silica. Interestingly, an opposite result is seen at higher temperatures i.e. 45 °C and 55 °C. Moreover, the difference in steady-state and dynamic state viscosity values decreases on addition of nanoclay. It is noted that an increase in concentration of clay increases the value of dynamic parameters whereas for STF of only fumed silica particles the values are constant irrespective of the change in concentration. More importantly, ease of processing, elasticity, stability and consistency of rheological results of STF increases to a significant extent on addition of relatively inexpensive nano-additive.

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