Study on impact resistance of <scp>Nano‐SiO<sub>2</sub></scp> reinforced <scp>STG</scp>/Kevlar composites
Huan Lin, Guojing Chen, Wanli Li, Lihai Cai, Wenyan Liu
Abstract
Abstract As a flexible protective material, shear thickening gel (STG)/Kevlar composite still has great potential to improve its impact resistance. In this paper, a novel STG/SiO 2 /Kevlar flexible protective composite was prepared by impregnating STG/SiO 2 into Kevlar. Due to the excellent SiO 2 enhancement effect, the STG/SiO 2 /Kevlar exhibited a higher safeguarding property than the STG/Kevlar. The maximum yarn pull‐out force of STG/SiO 2 /Kevlar reached 61.7 N, which was higher than the 41.9 N of STG/Kevlar. The uniform puncture results showed that the maximum bearing capacity of STG/Kevlar and STG/SiO 2 /Kevlar increased by 116.8% and 215.3%, respectively, compared with pure Kevlar. The impact test results indicated that 20 layers of STG/SiO 2 /Kevlar could not be penetrated by the knife stab and 24 layers of STG/SiO 2 /Kevlar could not be penetrated by 7.62 mm pistol bullets. Finally, the enhancement mechanism of impact resistance of STG/SiO 2 /Kevlar composites was studied.