Enhanced sandwich structure composite with shear thickening fluid and thermoplastic polyurethanes for High-performance stab resistance

2021 ◽  
pp. 114930
Author(s):  
Xiayun Zhang ◽  
Ting-Ting Li ◽  
Hao-Kai Peng ◽  
Ching-Wen Lou ◽  
Jia-Horng Lin
Keyword(s):  
High Performance ◽  
Sandwich Structure ◽  
Shear Thickening ◽  
Shear Thickening Fluid ◽  
Thermoplastic Polyurethanes ◽  
Stab Resistance

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 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 Shear-Thickening Fluid Using Oxygen-Plasma-Modified Multi-Walled Carbon Nanotubes to Improve the Quasi-Static Stab Resistance of Kevlar Fabrics

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1356 ◽  
Author(s):  
Danyang Li ◽  
Rui Wang ◽  
Xing Liu ◽  
Shu Fang ◽  
Yanli Sun
Keyword(s):  
Carbon Nanotubes ◽  
Loss Modulus ◽  
Shear Thickening ◽  
Woven Fabrics ◽  
Body Armor ◽  
Shear Thickening Fluid ◽  
Pull Out ◽  
Stab Resistance ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The excellent mechanical property and light weight of protective materials are vital for practical application in body armor. In this study, O2-plasma-modified multi-walled carbon nanotubes (M-MWNTs) were introduced into shear-thickening fluid (STF)-impregnated Kevlar woven fabrics to increase the quasi-static stab resistance and decrease the composite weight. The rheological test showed that the addition of 0.06 wt. % M-MWNT caused a marked increase in the peak viscosity from 1563 to 3417 pa·s and a decrease in the critical shear rate from 14.68 s−1 to 2.53 s−1. The storage modulus (G′) and loss modulus (G″) showed a higher degree of abrupt increase with the increase of shear stress. The yarn pull-out test showed that the yarn friction of M-MWNT/STF/Kevlar fabrics was far superior to the original fabrics. Importantly, under similar areal density, the M-MWNT/STF/Kevlar fabrics could resist 1261.4 N quasi-static stab force and absorb 41.3 J energy, which were much higher than neat Kevlar fabrics. The results of this research indicated that quasi-static stab resistance was improved by M-MWNTs, which was attributed to the excellent shear-thickening effect and the high yarn friction. Therefore, M-MWNT/STF/Kevlar fabrics have a broad prospect in the fields of body protection.

PVP immobilized SiO2 nanospheres for high-performance shear thickening fluid

2017 ◽  
Vol 19 (7) ◽  
Author(s):  
Mei Liu ◽  
Qian Chen ◽  
Sheng Wang ◽  
Linfeng Bai ◽  
Min Sang ◽  
...  
Keyword(s):  
High Performance ◽  
Shear Thickening ◽  
Shear Thickening Fluid

Rheological response and quasi-static stab resistance of STF/MWCNTs-impregnated aramid fabrics with different textures

2019 ◽  
Vol 50 (3) ◽  
pp. 380-397
Author(s):  
Ting-Ting Li ◽  
Xixi Cen ◽  
Haokai Peng ◽  
Haitao Ren ◽  
Lianhe Han ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Shear Thickening ◽  
Critical Shear Rate ◽  
Shear Thickening Fluid ◽  
Aramid Fabric ◽  
Stab Resistance ◽  
Multi Walled Carbon Nanotubes ◽  
Aramid Fabrics ◽  
Self Protection ◽  
Walled Carbon Nanotubes

Terrorist attacks occur constantly, which subsequently arouses awareness of self-protection. In order to alleviate the harm caused by sharp objects of knives and daggers, a design of flexible stab-resistant materials that are impregnated with the shear thickening fluid (STF)/multi-walled carbon nanotubes (MWCNTs) system and different texture of fabrics is presented. STF/MWCNTs are composed of polyethylene glycol (PEG 200) as the dispersion medium and silica (SiO2) of 12 nm and 75 nm as disperse phase as well as MWCNTs as supplementary reinforcement, in expectation to provide the aramid fabrics with high strengths, low critical shear rate, and a short thickening response time. The textures of aramid fabrics—plain (P), twill (T), satin (S), or basket (B) weave—are saturated in the STF/MWCNTs system. The synergetic influences of silica size and texture on tensile strength, quasi-static knife, and spike stab resistances of the STF/MWCNTs-impregnated aramid fabrics are examined. Results show that the plain aramid fabric immersed in the STF/MWCNTs system containing 12 nm SiO2(SM12) exhibit the maximum tensile strength and quasi-static knife stab resistance, 14.7 MPa and 8.9 MPa, respectively, which is 1.15 and 1.43 times higher than pure aramid fabrics. Moreover, the basket-weave aramid fabric immersed in the STF/MWCNTs system containing 12 nm SiO2have the maximum quasi-static spike stab resistance of 17.12 MPa compared to other textures of fabrics, which is 1.05 times higher than those immersed in the 75 nm SiO2STF/MWCNTs (SM75) system and 1.33 times higher than that of pure basket aramid fabrics.

High performance shear thickening fluid based on calcinated colloidal silica microspheres

2015 ◽  
Vol 24 (8) ◽  
pp. 085033 ◽  
Author(s):  
Sheng-Biao Zheng ◽  
Shou-Hu Xuan ◽  
Wan-Quan Jiang ◽  
Xing-Long Gong
Keyword(s):  
High Performance ◽  
Colloidal Silica ◽  
Shear Thickening ◽  
Silica Microspheres ◽  
Shear Thickening Fluid

Stab resistance of shear thickening fluid (STF)-treated fabrics

2007 ◽  
Vol 67 (3-4) ◽  
pp. 565-578 ◽  
Author(s):  
M.J. Decker ◽  
C.J. Halbach ◽  
C.H. Nam ◽  
N.J. Wagner ◽  
E.D. Wetzel
Keyword(s):  
Shear Thickening ◽  
Shear Thickening Fluid ◽  
Stab Resistance

The cut resistant characteristics of organic high-performance yarns and STF/yarns

2018 ◽  
Vol 49 (10) ◽  
pp. 1317-1333 ◽  
Author(s):  
Lijuan Wang ◽  
Kejing Yu ◽  
Diantang Zhang ◽  
Kun Qian
Keyword(s):  
Synergistic Effect ◽  
Energy Conversion ◽  
High Performance ◽  
Shear Thickening ◽  
Theoretical Relation ◽  
Shear Thickening Fluid ◽  
Fracture Surfaces ◽  
Shear Thickening Fluids ◽  
External Forces

This paper mainly investigated the cut resistant property of shear thickening fluid enhanced organic high-performance yarn. Cut tests of neat yarn and shear thickening fluids/yarn were performed with two cutting angles. External forces involved in the cutting were analyzed. A simple theoretical relation was established based on the principle of the energy conversion. Two types of shear thickening fluids were prepared. Compared to neat yarn, the shear thickening fluids/yarn exhibited extremely high cut resistant property, especially, shear thickening fluids/yarn with graphene, indicating a synergistic effect. Fracture surfaces of fibers after yarns cut off were initially studied, which verified the cut resistant characteristics of organic high-performance yarns and shear thickening fluids/yarn.

Incorporation of shear thickening fluid effects into computational modelling of woven fabrics subjected to impact loading: A review

2019 ◽  
Vol 11 (3) ◽  
pp. 340-378 ◽  
Author(s):  
Dakshitha Weerasinghe ◽  
Damith Mohotti ◽  
Jeremy Anderson
Keyword(s):  
Numerical Modelling ◽  
High Performance ◽  
Impact Resistance ◽  
Computational Modelling ◽  
Shear Thickening ◽  
Woven Fabrics ◽  
Shear Thickening Fluid ◽  
Shear Thickening Fluids ◽  
Layered Fabric ◽  
The Impact

Soft armour consisting of multi-layered high-performance fabrics are a popular choice for personal protection. Extensive work done in the last few decades suggests that shear thickening fluids improve the impact resistance of woven fabrics. Shear thickening fluid–impregnated fabrics have been proven as an ideal candidate for producing comfortable, high-performance soft body armour. However, the mechanism of defeating a projectile using a shear thickening fluid–impregnated multi-layered fabric is not fully understood and can be considered as a gap in the research done on the improvement of soft armour. Even though considerable progress has been achieved on dry fabrics, limited studies have been performed on shear thickening fluid–impregnated fabrics. The knowledge of simulation of multi-layered fabric armour is not well developed. The complexity in creating the geometry of the yarns, incorporating friction between yarns and initial pre-tension between yarns due to weaving patterns make the numerical modelling a complex process. In addition, the existing knowledge in this area is widely dispersed in the published literature and requires synthesis to enhance the development of shear thickening fluid–impregnated fabrics. Therefore, this article aims to provide a comprehensive review of the current methods of modelling shear thickening fluid–impregnated fabrics with a critical analysis of the techniques used. The review is preceded by an overview of shear thickening behaviour and related mechanisms, followed by a discussion of innovative approaches in numerical modelling of fabrics. A novel state-of-the-art means of modelling shear thickening fluid–impregnated fabrics is proposed in conclusion of the review of current methods. A short case study is also presented using the proposed approach of modelling.

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