摘要：
以防护结构设计为背景,提出一种铝蜂窝填砂复合夹芯结构.从理论角度对填砂蜂窝模型进行力学分析,通过落锤冲击试验,对不同芯层规格的试件在梯度能级冲击下的响应进行了对比,根据荷载、位移和挠度的变化规律和破坏模式得到以下结论:在低能级冲击下,蜂窝芯层较软的试件填砂后对于其结构强度和刚度的提升作用较为明显,同时,在铝蜂窝质量相同的前提下,优先选择蜂窝胞元较小、高度较低的蜂窝作为填砂复合夹芯结构的芯层,可提高结构比强(刚)度;在高能级冲击下,当芯层高度达到一定值时,变形挠度减小,破坏范围缩小为局部贯穿破坏,芯层填砂对结构抗冲击性能产生较为积极的影响.研究结果为铝蜂窝填砂复合夹芯结构在防护结构中的应用奠定了基础.%With the background of a protective structure designing,a kind of sand-filled aluminum honeycomb composite sandwich structures was put forward.The simplified sand-filled honeycomb model was analyzed from the standpoint of mechanics.By drop weight impact tests,the specimens with different core specifications were compared with the empty-core specimens under gradient impact.By comparing the changing of the impact load,the displacement of impactor,the deflection and the damage mode of specimens,some conclusions were drawn as follows:under low-energy impact,the effect of filling sand on the strength promoting of the honeycomb structure with softer core and on the reducing of its deflection was relatively better;on the premise of the same mass,the honeycomb with smaller size and smaller height should be given priority to be adopted as the core of sand-filled composite sandwich structures for improving the specific strength or stiffness;under high-energy impact,as the core layer height reaches a certain value,the deflection of specimen decreases,and the damage scope is narrowed down to a local area with fully penetration.Filling sand in the honeycomb is beneficial to the improvement of impact resistance.The research provides a basis for the practical application of sand-filled aluminum honeycomb composite sandwich structures in protection.
