为研究爆炸冲击波和破片联合作用下复合夹芯结构的防护能力和毁伤机理,采用TNT和预制破片开展了冲击波和破片联合作用下玻璃纤维夹芯结构的联合毁伤实验.研究玻璃纤维复合夹芯结构的毁伤特性,将其防护能力与芳纶、高强聚乙烯复合夹芯结构进行了量化对比,并分析了冲击波和破片联合作用下复合夹芯结构前面板、芯层、后面板的破坏模式及相应破坏机理.结果表明:选用复合夹芯结构抗冲击波和破片联合毁伤时,同等防护能力所需E玻璃纤维芯层重量分别为芳纶芯层、高强聚乙烯芯层的1.37倍、2.50倍;前面板破坏模式主要由冲击波载荷、破片载荷、芯层约束3方面因素共同决定;破片载荷对芯层破坏模式起主要作用,后面板破坏模式与芯层碰撞、破片载荷两方面因素有关,其中冲击波载荷和芯层碰撞为面载荷,使前后面板产生整体弯曲变形,破片载荷为点载荷,使面板和芯层产生局部的穿甲破孔,芯层约束限制了前面板变形空间.%In order to explore the protection ability and damage mechanism of glassfiber sandwich bulkhead under explosion and fragment loadings,the deformation and failure tests of glassfiber sandwich structure were performed using cast TNT and prefabricated fragments.The damage characteristics of glassfiber composite sandwich structure,of which protection ability is quantitatively compared with those of aramid and high-strength polyethylene composite sandwich structures,are studied,and the failure mode of each layer composite sandwich structure and its corresponding failure mechanism are analyzed.The results show that E-glass core is required to be 1.37 times and 2.50 times heavier than aramid core and highstrength polyethylene core,respectively,when sandwich structure is applied to resist explosion and fragment loadings.The failure mode of front panel is co-determined by three factors,including shock wave,fragment load,and core constraint.Fragment load plays a major role on core failure mode,the failure mode of rear panel is related to core impact and fragment load.The shock wave and core impact are surface loads,which lead to the bending deformation of front and rear panels,the fragment load is point load,which leads to the local piercing holes on panel and core,and the core constraint limits the deformation space of the front panel.
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