热塑性复合材料蜂窝夹芯板的低速冲击失效行为

Low-velocity impact failure behavior of thermoplastic composite honeycomb sandwich panel

夹芯结构具有优良的力学性能和多功能性,是一类良好的冲击防护材料。以编织玻璃纤维增强聚丙烯复合材料蜂窝夹芯板为研究对象,采用JSL-3000落锤式示波冲击试验机研究了其结构在低速冲击下的抗冲击特性。试验采用固支的边界条件,通过控制落锤下落高度实现不同冲击能量对结构低速冲击响应的影响;并在相同的冲击能量下,研究了蜂窝夹芯结构芯层高度和芯层层数对结构抗冲击性能的影响。利用ABAQUS有限元软件建立了蜂窝夹芯板的低速冲击模型与试验结果进行对比,通过对获得的载荷时间曲线和结构失效模式的分析,发现结构的损伤以上面板的凹陷和芯层的压溃为主,在面板未发生穿透的情况下结构会发生大幅度回弹。

Sandwich structures with excellent mechanical properties and multifunctional potentials can be applied as favorable impact protective structures. Low velocity impact resistance of woven fiber reinforced polypropylene honeycomb sandwich panel was experimentally studied using drop weight tester. Effect of impact energy on structural response under four sides fixed condition was investigated by changing drop height. Under the same impact energy, the effects of core height and core layer number on the impact resistance were also studied. Finite element model of honeycomb sandwich panel subjected to low velocity impact was established by ABAQUS and compared with experimental results in terms of load-time curves and failure modes. It was found that local depression of upper face sheet and core collapse were the dominate failure modes and a significant rebound of honeycomb sandwich panel was found when face sheet was not penetrated.