近距爆炸破片作用下芳纶纤维夹芯复合舱壁结构毁伤特性实验研究

为提高近距爆炸破片作用下夹芯结构的毁伤机理和防护能力,采用梯恩梯和预制破片开展了近距爆炸破片作用下芳纶纤维夹芯结构的联合毁伤实验研究。揭示了破片的载荷特性,分析了芳纶纤维夹芯结构中各层结构的破坏模式,探讨了其抗毁伤机理,并与文献14]中典型夹芯结构的防护能力进行了对比和排序。结果表明:夹芯防护结构中芯层起到了毁伤载荷的"中介"转化作用;通过对后面板撞击挤压,把着靶面积小、作用时间短且破坏能力强的破片点载荷转换为作用面积大、持续时间长的压力面载荷,扩大了载荷作用范围。综合材料质量和防护能力来看,气凝胶毡隔温层/高强聚乙烯夹芯结构防护能力优于芳纶纤维夹芯结构。

Experimental Research on Damage of Aramid Fiber Sandwich Bulkhead under Close Range Explosion and Fragment Loadings

In order to improve the protection ability and damage mechanism of aramid fiber sandwich bulkhead under close range explosion and fragment loadings, the deformation and failure tests of aramid fiber sandwich structure are performed, and TNT and prefabricated fragments are used in the test. The load characteristics of fragments are revealed, and the failure mode of each layer in sandwich structure is analyzed. The anti-damage mechanism of sandwich structure is discussed, and the protection ability of aramid fiber sandwich structure is compared with those of the typical sandwich structures in Ref.\14\]. The results show that the core layer in the sandwich protective structure plays a role in intermediary transformation of damage load. A fragment point load with small impact area, short duration and severe damage is converted into a pressure surface load with large action area and long duration by squeezing the rear plate, which expands the action range of loads. In view of material weight and protective capability, the protective capability of high strength polyethylene sandwich structure is superior to that of aramid fiber sandwich structure.