Investigation of impact resistance of multilayered woven composite barrier impregnated with the shear thickening fluid

Abstract

Dynamic properties of the Shear Thickening Fluid (STF) are studied. Two series of tests by the Split Hopkinson Pressure Bar method were carried out to determine the dynamic bulk and shear properties of STF. The hypothesis about the possibility to describe STF behavior by a Newtonian fluid model in the characteristic range of strain rates is confirmed. A simplified mathematical model of the STF is then formulated for the use in computer simulation of ballistic impact tests of multilayered composite protective shells. The effectiveness of the STF impregnation for improvement of ballistic impact characteristics of Kevlar woven fabrics is confirmed. It is concluded that the role of the contact conditions between STF and Kevlar basis in the process of increasing the energy absorption capacity of Kevlar-STF barrier is significant, noting that the mechanism of contact interaction between STF and Kevlar basis can be described by viscous friction law, i.e., the STF behaves almost as a rigid body during the interactions with the solids, while it normally behaves as a fluid. It is also established that the STF impregnation of protective shells with titanium framework not only increases the absorption capacity of the whole package but also reduces the deflection of the metal base.

High strain-rate dynamic mechanical properties of Kevlar fabrics impregnated with shear thickening fluid

“…According to the one-dimension stress wave propagation theory [36][37][38][39][40][41][42][43], the dynamic stress, dynamic strain and the dynamic strain rate in the sample can be expressed as: …”

“…The split Hopkinson pressure bar (SHPB) system is widely used to test the mechanical properties of materials at high strain rates varying from 10 2 s -1 to 10 4 s -1 [36][37][38][39][40][41][42][43]. A stress pulse is generated while the striker bar hits the incident bar.…”

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

“…Liquid body armour based on the inclusion of STF have been studied intensively during the last decade [2][3][4][5], and several commercial products (mostly reinforced soft protections based generally on aramid fibres) are available on the market. However, very few works have been done on the design of stiff composite materials with embedded STF (without the use of aramid woven fabric).…”

Dynamic response of shear thickening fluid under laser induced shock

“…8,11 The viscosity recovers rapidly when the shear loading is removed. 11 Due to the excellent energy absorption behavior STF has founded applications in variety of fields such as damping, 14 armor, [15][16][17][18] to name a few. Since the impact resistance of STF is dynamic by nature, it is crucial to understand the dynamic response of the suspensions itself under dynamic loading at various pressures and strain rates.…”