Enhancement of the ballistic performance of aramid fabric with polyurethane and shear thickening fluid

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.

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Rheometry of novel shear thickening fluid and its application for improving the impact energy absorption of p-aramid fabric

Thin-Walled Structures ◽

10.1016/j.tws.2020.106954 ◽

2020 ◽

Vol 155 ◽

pp. 106954

Author(s):

Aranya Ghosh ◽

Abhijit Majumdar ◽

Bhupendra Singh Butola

Keyword(s):

Energy Absorption ◽

Impact Energy ◽

Shear Thickening ◽

Shear Thickening Fluid ◽

Aramid Fabric ◽

The Impact

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

Journal of Industrial Textiles ◽

10.1177/1528083719830144 ◽

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.

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Ballistic performance of p-aramid fabrics impregnated with shear thickening fluid; Part II – Effect of fabric count and shot location

Textile Research Journal ◽

10.1177/0040517511420765 ◽

2012 ◽

Vol 82 (6) ◽

pp. 542-557 ◽

Cited By ~ 55

Author(s):

Jong Lyoul Park ◽

Byung Il Yoon ◽

Jong Gyu Paik ◽

Tae Jin Kang

Keyword(s):

Shear Thickening ◽

Ballistic Performance ◽

Shear Thickening Fluid ◽

Aramid Fabrics

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Interactive effects of p-aramid fabric structure and shear thickening fluid on impact resistance performance of soft armor materials

Materials & Design ◽

10.1016/j.matdes.2015.09.077 ◽

2016 ◽

Vol 89 ◽

pp. 286-293 ◽

Cited By ~ 53

Author(s):

Animesh Laha ◽

Abhijit Majumdar

Keyword(s):

Impact Resistance ◽

Shear Thickening ◽

Interactive Effects ◽

Shear Thickening Fluid ◽

Fabric Structure ◽

Aramid Fabric ◽

Resistance Performance

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Preparation and Ballistic Performance of a Multi-Layer Armor System Composed of Kevlar/Polyurea Composites and Shear Thickening Fluid (STF)-Filled Paper Honeycomb Panels

Polymers ◽

10.3390/polym13183080 ◽

2021 ◽

Vol 13 (18) ◽

pp. 3080

Author(s):

Chang-Pin Chang ◽

Cheng-Hung Shih ◽

Jhu-Lin You ◽

Meng-Jey Youh ◽

Yih-Ming Liu ◽

...

Keyword(s):

Impact Resistance ◽

Shear Thickening ◽

High Strength ◽

Ballistic Performance ◽

Protective Material ◽

Shear Thickening Fluid ◽

Fabric Composite ◽

Ballistic Test ◽

Paper Honeycomb ◽

Resistant Layer

In this study, the ballistic performance of armors composed of a polyurea elastomer/Kevlar fabric composite and a shear thickening fluid (STF) structure was investigated. The polyurea used was a reaction product of aromatic diphenylmethane isocyanate (A agent) and amine-terminated polyether resin (B agent). The A and B agents were diluted, mixed and brushed onto Kevlar fabric. After the reaction of A and B agents was complete, the polyurea/Kevlar composite was formed. STF structure was prepared through pouring the STF into a honeycomb paper panel. The ballistic tests were conducted with reference to NIJ 0101.06 Ballistic Test Specification Class II and Class IIIA, using 9 mm FMJ and 44 magnum bullets. The ballistic test results reveal that polyurea/Kevlar fabric composites offer better impact resistance than conventional Kevlar fabrics and a 2 mm STF structure could replace approximately 10 layers of Kevlar in a ballistic resistant layer. Our results also showed that a high-strength composite laminate using the best polyurea/Kevlar plates combined with the STF structure was more than 17% lighter and thinner than the conventional Kevlar laminate, indicating that the high-strength protective material developed in this study is superior to the traditional protective materials.

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