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Evaluation of ballistic performance of STF impregnated fabrics under high velocity impact

机译：STF浸渍织物在高速冲击下的弹道性能评估

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摘要

Shear thickening fluid (STF) impregnated fabrics offer improved ballistic performance against impacts, but the effect becomes not obvious at high impact velocity (e.g. 300 m/s) as reported by some. This paper presents findings from an investigation of STF-impregnated fabric panels against ballistic impact, and attempts to identify the failure mechanisms of such panels under high velocity impact, which will shed light on effects of STF-impregnated fabrics for low and high velocity impacts. Single-ply and 10-ply neat and STF-impregnated aramid fabric panels were experimented on at impact velocities around 500 m/s. The results indicated that the specific energy absorption of the single-ply and 10-ply STF impregnated fabric panels was 44.8% and 64.1% lower than that of their neat counterparts respectively. The mechanisms were studied theoretically and morphologically. It was found that the projectile velocities perforating the fabrics were decreased by STF impregnation due to the total movement constraint of the primary yarns. This changes the failure mode from tensile dominant to shear dominant, increases the possibility of earlier damage and failure of the primary yarns, and reduces the pull out distance, causing decrease in the energy absorption. The findings are significant for guiding further design of STF impregnated fabric panels for ballistic protection.
机译：剪切增稠剂（STF）浸渍的织物可提供更好的抗冲击性能，但据某些人报道，这种效果在高冲击速度（例如300 m / s）下并不明显。本文介绍了对STF浸渍的织物板进行防弹冲击研究的结果，并试图确定这种板在高速冲击下的破坏机理，这将阐明STF浸渍的织物对低速和高速冲击的影响。以约500 m / s的冲击速度对单层和10层纯净，STF浸渍的芳纶织物板进行了试验。结果表明，单层和10层STF浸渍织物面板的比能量吸收分别比其纯净同行者低44.8％和64.1％。从理论上和形态上研究了机理。已经发现，由于初级纱线的总运动约束，STF浸渍会降低贯穿织物的弹丸速度。这将破坏模式从拉伸为主转变为剪切为主，增加了初级纱线早期损坏和破坏的可能性，并缩短了拉出距离，从而导致能量吸收降低。这些发现对于指导STF浸渍织物板的防弹设计具有指导意义。

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