芯材高度对三维中空夹芯复合材料低速冲击性能的影响

选取芯材高度分别为5、6、7 mm 的三维中空夹芯复合材料为研究对象,采用落锤式低速冲击试

验装置分别对上述材料进行8 J 能量的低速冲击测试,研究材料的低速冲击性能;利用Instron 3385H 型万能材

料试验机分别测试上述材料受到低速冲击载荷前后的压缩强度,研究材料受到低速冲击载荷后的压缩损伤容

限。结果表明:三维中空夹芯复合材料对低速冲击载荷比较敏感;随着芯材高度的增加,材料抗低速冲击性能

有所增加;低速冲击载荷使材料的剩余压缩强度大幅下降。

Influence of Pile Height on Low-Velocity Impact Properties ofThree Dimension Hollow Sandwich Composites

Three dimension hollow sandwich composites (3D composites) with pile height of 5, 6 and 7 mm

were selected as object of study. In order to study low-velocity impact properties of the 3D composites, low-velocity

impact testing was conducted by using drop hammer low-velocity impact tester at energy of 8 J. In addition, compressive

strength of the 3D composites before and after impacting was tested by using universal material testing machine

(Instron 3385H) for studying compressive damage tolerance of the 3D composites suffering low-velocity impact loads.

The results indicate that the 3D composites were sensitive to low-velocity impact loads. Low-velocity impact properties

increased with the increase of pile height of the 3D composites. Residual compressive strength of the 3D composites

declined sharply after suffering low-velocity impact loads. The results contribute to the optimal design of the 3D sandwich

composites.