侵彻作用下负泊松比蜂窝夹芯结构动态响应

Dynamic Response of Honeycomb Sandwich Plate with Negative Poisson s Ratio under Penetration

随着战争的不断加剧,弹丸对高价值设施有严重威胁,提高各类设施的抗侵彻性能尤为关键。通过弹道枪实验和数值模拟方法研究3D打印蜂窝夹芯结构的抗侵彻性能。通过弹道冲击实验对比分析7块试件的动态响应。夹芯结构由Q345钢顶板、碳纤维增强复合材料(CFRP)背板和铝合金蜂窝芯层组成。实验对比了3种蜂窝芯层构型:泡沫铝、正六边形及具有负泊松比效应的内凹六边形。对比结果表明,与蜂窝芯层为泡沫铝和正泊松比的蜂窝夹芯结构相比,负泊松比蜂窝夹芯结构残余速度较低,抗侵彻性能较强。通过数值模拟研究获得了负泊松比蜂窝夹芯结构的动态响应过程。通过参数分析进一步得到胞元内折角度、背板厚度以及背板类型对负泊松比蜂窝夹芯结构抗侵彻性能的影响规律。数值研究结果表明,3种因素对蜂窝夹芯结构抗侵彻性能均存在一定影响。运用非支配遗传算法对初始蜂窝夹芯结构进行多目标优化,在保证相同弹道极限速度的前提下使得其质量减轻21.1%。

With the intensification of war,projectiles pose a serious threat to high-value facilities,and improving the anti penetration performance of various facilities is particularly crucial.Study the anti penetration performance of 3D printed honeycomb sandwich structure through ballistic gun experiments and numerical simulation methods.Compare and analyze the dynamic response of 7 specimens through ballistic impact experiments.The sandwich structure consists of a Q345 steel top plate,a carbon fiber reinforced composite(CFRP)back plate,and an aluminum alloy honeycomb core layer.Three honeycomb core configurations are compared experimentally:foam aluminum,positive hexagon and concave hexagon with Negative Poisson s ratio effect.The results show that compared with the honeycomb sandwich structure with foam aluminum core and positive Poisson s ratio,the honeycomb sandwich structure with Negative Poisson s ratio has lower residual velocity and stronger penetration resistance.The dynamic response process of honeycomb sandwich structure with Negative Poisson s ratio is obtained through numerical simulation.Through parameter analysis,the influence of cell inflection angle,back plate thickness and back plate type on the anti penetration performance of honeycomb sandwich structures with Negative Poisson s ratio is further obtained.The numerical research results indicate that all three factors have a certain impact on the anti penetration performance of honeycomb sandwich structures.The non dominated genetic algorithm is used to optimize the honeycomb sandwich structure with initial Negative Poisson s ratio,and its mass is reduced by 21.1%under the premise of ensuring the same ballistic limit speed.