Study of mechanical property of shear thickening fluid (STF) for soft body-armor
Study of mechanical property of shear thickening fluid (STF) for soft body-armor
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DOI：
10.1088/2053-1591/abf76a
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发表时间：
2021-04-01
影响因子：
2.3
通讯作者：
Wang, Ping
中科院分区：
文献类型：
--
作者：
Wang, Lijuan;Du, Zhaofang;Wang, Ping
由于STF具有可逆和可重复增厚的特性，STF已被广泛应用于柔性防弹衣。然而，以流变特性为特征的剪切增稠机理不能很好地解释STF抗渗透和抗冲击的增稠机理。本文在INSTRON试验机上进行了金属棒对STF的准静态挤压和拔出循环试验。讨论了速度、界面条件、边界条件等因素的影响。典型的位移-荷载曲线表明，当应变率达到临界值时，STF在正常荷载下发生突变。以拉拔试验为例，在不增厚STF的情况下，拉拔力为一恒定值，约为1.5N。随着STF的增厚，最大力约为150 N，由于STF的增厚，其增加了100倍。对挤压过程中纳米颗粒在STFs中的聚集行为进行了简单的模拟。实验和模拟研究证明，在正常负载下，STF中的SiO2纳米颗粒会重新排列，形成堵塞区。
STFs have been widely used for soft body-armor because of STF reversible and repeatable thickening characteristics. However, shear thickening mechanism characterized by rheological properties cannot well explain thickening mechanism of STF against the penetrations and impacts. In this study, a cycle experiment of quasi-static squeeze and pull-out of STF by metal rod were carried out on the INSTRON. Effects of velocity, interface condition and boundary et al were discussed. Typical displacement-load curves show that STF thicken in the normal load when the rate reach critical value. Taking a pull-out experiment as example, force without thickening of STF is a constant value, about 1.5 N. The maximum force with thickening of STF is about 150 N, which increases 100 times due to the thickening of STF. A simple simulation of clustering behavior of nano-particles in STFs in the squeeze process is depicted. The experiment and simulation studies have proved that SiO2 nano-particles in STF will rearranged to cause a jammed zone in the normal load.