不同纤维面层对泡沫夹层复合材料低速冲击性能的影响

采用玻璃纤维、碳纤维、混杂碳/Kevlar和Kevlar纤维织物为面层,自制闭孔硬质聚氨酯泡沫芯材,通过RTM工艺制备了泡沫夹芯复合材料,分析了25J能量下的冲击损伤程度。提出了以泡沫夹芯结构的平均损伤角度、穿透深度和最大开裂宽度作为表征试样损伤程度的参数。结果表明:25J冲击能量下,Kevlar纤维面层泡沫夹芯试样,冲击载荷—时间历程曲线峰值最高,完成一次冲击试验历程最短,冲击后试样损伤程度最低;玻璃纤维面层泡沫夹芯试样,低速冲击载荷—时间历程曲线峰值最低,冲击后试样损伤程度最高。

Work on Low -velocity Impact Properties of Foam Sandwich Composites with Various Face Sheets

Foam core sandwich composites in conjunction with various facings composed of glass,stitching glass,carbon,carbon/Kevlar hybrid,and Kevlar fabric were fabricated by using RTM process;and low-velocity impact（LVI） performance was studied at three energy levels.This paper proposes that the damage extent of foam core sandwich construction may be characterized by the average damage angle、penetration depth and maximal crushed width.The results show that at 25J,foam core samples with Kevlar facing are optimal for the peak load at load versus time plot,the shortest history course and the lowest impact damage extent.The foam core samples with glass facing are the longest history course and the maximal impact damage extent.