钝头弹撞击不同材质蜂窝夹芯板的损伤特性研究

Study on Damage Characteristics of Honeycomb Sandwich Plates with Different Material Impacted by Blunt-Nosed Projectiles

利用一级气炮系统发射钝头弹进行铝蜂窝夹芯板与纸蜂窝夹芯板的撞击实验,分析靶板材质对弹道极限、夹芯板失效模式和比能量吸收的影响规律及机理。结果表明:钝头弹撞击铝蜂窝夹芯板的弹道极限高于纸蜂窝夹芯板。与纸蜂窝夹芯板相比,铝蜂窝夹芯板受钝头弹撞击前面板产生明显的凹坑变形与纤维分层现象;芯体由撞击撕裂破坏转变为褶皱折叠变形与压溃失效;后面板由纤维拉伸断裂与菱形鼓包变形转变为纤维拉伸失效下大面积的菱形分层破坏,纤维条撕裂的形状由片状转变为带状;前面板与芯体生成的撞击碎屑转变为规则的圆形冲塞。铝蜂窝夹芯板的比能量吸收明显高于纸蜂窝夹芯板。

The aluminum honeycomb sandwich plates and paper honeycomb sandwich plates were impacted by the blunt-nosed projectiles launched by a one-stage gas gun,and the influence of material of targets on the ballistic limits,failure modes and specific energy absorption(SEA)were analyzed.The results show that the ballistic limit of aluminum honeycomb sandwich plates impacted by blunt-nosed projectiles are higher than paper honeycomb sandwich plates.Compared with the paper honeycomb sandwich plates,the aluminum honeycomb sandwich plates generate obvious pit deformation and fiber stratification on the front panel after impact by blunt-nosed projectiles,the failure mode of core changes from impact tear damage to fold collapse deformation and collapse failure,rear panel is transformed by the fiber tensile fracture and rhombic bulge deformation into large area of rhombic delamination under fibers tension failure,the shape of torn fiber strip changes from sheet to strip,the impact debris generated by the front panel and the core transforms into a regular circular plug.The specific energy absorption of aluminum honeycomb sandwich plates is significantly higher than paper honeycomb sandwich plates.