平纹机织与2.5D机织复合材料平板弹道冲击特性对比

Comparison of ballistic impact behaviors between plain woven and 2.5D woven fabric composite plates

为研究碳纤维平纹机织和碳纤维2.5D机织复合材料平板的弹道冲击响应及失效模式,在空气炮装置上使用圆柱弹体对其进行了弹道冲击试验。通过弹道极限速度、吸能总量、单位面密度吸能量和单位厚度吸能量等指标评估其弹道冲击特性,并采用超声C扫描和CT扫描唯象分析其冲击损伤。结果表明:在等厚度下,碳纤维平纹机织复合材料平板与碳纤维2.5D机织复合材料平板相比,展现了更优的弹道冲击性能。碳纤维平纹机织复合材料平板的主要失效模式为分层失效,碳纤维2.5D机织复合材料平板主要为剪切充塞失效。与碳纤维2.5D机织复合材料平板相比,平纹机织复合材料平板弯曲变形明显,大量的纤维拉伸失效增加了平板吸能量,提高了弹道极限速度,但分层会导致平板损伤区域大,完整性较差;碳纤维2.5D机织复合材料平板损伤区域小,完整性好。

To research the ballistic impact response and failure modes of carbon fiber plain woven and 2.5 D woven fabric composite plates,ballistic impact tests were conducted in the gas gun employing the cylindrical projectile.The ballistic impact behavior was evaluated based on the ballistic limit velocity,total energy absorption,energy absorption per surface density,and energy absorption per thickness,and the impact damage was further analyzed by ultrasonic C-scan and CT scan.The results show that the plain woven fabric composite plates exhibit better ballistic impact performance than the 2.5 D woven fabric composite plates.The plain woven fabric composite plates mainly produced delamination failure.The 2.5 D woven fabric composite plates mainly produced shear stuffing failure.Compared with the 2.5 D woven composite plates,the plain woven composite plates were bent and deformed obviously.A large number of fiber tensile failures caused by bending increased the energy absorption of the plate and increase the ballistic limit velocity.But the delamination led to large damage area and poor integrity of the plain woven composite plates.The 2.5 D woven fabric composite plates had smaller damage area and better integrity.