纤维织物袋的内爆响应与抗爆性能

Implosion response and anti-explosion performance of fabric bags

针对小型简易爆炸装置,设计了芳纶和超高分子量聚乙烯(UHMWPE)纤维织物防爆袋,开展了织物袋内爆试验,同时建立了织物袋内爆数值分析模型。从外部超压和临界厚度两个角度对比了两种材料织物袋的抗爆能力,分析了初始内爆距离和织物袋厚度对织物袋抗爆性能的影响。结果表明:内爆载荷下织物袋的主要失效模式为中心区域破孔和封口拉链失效。在20~100 g药量范围内,织物袋的临界厚度与药量近似呈线性增长关系。同一药量下,芳纶织物袋的临界厚度明显大于UHMWPE织物袋,在不考虑爆炸火球对织物烧蚀的影响时,UHMWPE织物袋具有更好的抗爆效果。厚度相同时,芳纶织物袋外部的超压峰值更小,表明芳纶织物袋的超压衰减能力更强。随着织物袋初始内爆距离的增大,织物袋的临界厚度减小。织物袋外部一定范围内存在高于人体能够承受的超压,以30 g TNT、3 mm厚芳纶织物袋为例,在距织物袋中心665 mm处的超压为34.2 kPa,超过鼓膜损伤阈值。

Aramid and ultra-high molecular weight polyethylene(UHMWPE)fiber fabric bags were designed for the disposal of improvised explosive device(IED).The implosion test was carried out,and a finite element(FE)model of fabric bag implosion was established.The anti-explosion abilities of the two fabric bags were compared from the perspectives of external overpressure and critical thickness,and the effects of the initial implosion distance and the thickness of the fabric bag on the anti-explosion ability were analyzed.The results show that the main failure modes of the fabric bag under implosion load are broken hole in the center area and the failure of the sealing zipper.The critical thickness of the fabric bag increases approximately linearly with the charge in the range of 20-100 g TNT charge.The critical thickness of the aramid fabric bag is significantly larger than that of the UHMWPE fabric bag when the charges are the same.The UHMWPE fabric bag has a better anti-explosion ability without considering the influence of the explosion fireball.When the thicknesses are the same,the overpressure outside the aramid fabric bag is smaller,indicating that the overpressure attenuation ability of the aramid fabric bag is better.As the initial implosion distance of the fabric bag increases,the critical thickness decreases.There is an overpressure higher than the human body which can withstand within a certain range outside the fabric bag.Taking the 30 g TNT,3 mm aramid fabric bag condition as an example,the overpressure at 665 mm from the center of the fabric bag is 34.2 kPa,exceeding the eardrum damage threshold.