复合材料天线结构低速冲击损伤与剩余强度

Low-velocity impact damage and residual strength of composite antenna structures

共形承载复合材料天线结构兼具力学承载和微波通信功能,由于其高度集成化和多功能化特点,应用前景广阔,但在制造和维修过程中极易受外来物的低能量冲击产生损伤。本文采用热压罐成型和二次胶结工艺制备以玻璃纤维增强复合材料为面板、以PMI泡沫为芯材并嵌入天线器件的复合材料天线结构。并对其开展低速冲击及冲击后压缩试验研究,对比含天线和不含天线两种结构的损伤特性与冲击后剩余压缩(CAI)强度。结果表明:与普通泡沫夹芯结构相比,复合材料天线结构的凹坑深度、冲击位移和背面纤维束拔出高度均减小,表明损伤阻抗能力增强;峰值载荷显著增加,100 J冲击能量下的峰值载荷为5.79 kN,增加了25.32%;压缩强度和CAI强度显著提高,压缩强度提高了28.87%,CAI强度提高超过113.08%;冲击破坏模式由整体贯穿及芯体大面积断裂变为芯体局部压溃、天线单元塑性变形及与泡沫夹芯大面积脱胶。

Due to its highly integration and multifunctional features,conformal load-bearing composite antenna structure with mechanical load-bearing and microwave communication function has a wide range of application in aerospace field.However,it is easy to be damaged by the low energy impact in the process of manufacturing and maintenance.A composite antenna structure with glass fiber reinforced composite as the panel,PMI foam as the core material and embedded antenna devices were prepared by the autoclave curing and secondary bonding process.The damage and compression strength(CAI)response of the composite sandwich structures with and without antenna layer were investigated by the low-velocity impact test and post-impact compression tests.The results indicate that the dent depth,displacement and fiber pull-out height of the composite antenna structure are smaller than that of the structure without antenna layer,which indicates that the damage resistance capability of the composite antenna structure improves significantly.When 100 J of impact energy is applied to the structure,the peak load significantly increases with a value of 5.79 kN,which increased by 25.32%.Compression strength and CAI strength increased significantly,with 28.87%increase in compression strength and over 113.08%increase in CAI strength.The damage mode changes from overall penetration and large area fracture of the core to local crushing of the core,plastic deformation of the antenna unit and large area debonding from the foam core.