泡沫铝子弹高速撞击下铝基复合泡沫夹层板的动态响应

应用一级轻气炮驱动泡沫铝弹丸高速撞击加载技术，对实心钢板以及前/后面板为Q235钢板、芯层分别为铝基复合泡沫和普通泡沫铝的夹层板结构，在脉冲载荷作用下的动态力学响应进行实验研究。结果表明:泡沫铝子弹高速撞击靶板可近似模拟爆炸载荷效果；铝基复合泡沫夹层板的变形分为芯层压缩和整体变形两个阶段；与其他靶板相比，铝基复合泡沫夹层板的抗冲击性能最优。基于实验研究，应用LS-DYNA非线性动力有限元软件，对泡沫铝夹层板的动态响应进行数值模拟。结果表明:泡沫铝子弹的长度和初始速度对子弹与夹层板之间的接触作用力影响显著，并且呈线性关系。泡沫芯层强度对等质量及等厚度夹层板的抗冲击性能均有显著影响，夹层板中心挠度对前、后面板的厚度匹配较为敏感，在临界范围内，若背板厚度大于面板厚度，可减小夹层板的最终挠度。夹层板面板宜采用刚度较低、延性好、拉伸破坏应变较大的金属材料。

Dynamic response of aluminum matrix syntactic foams sandwich panel subjected to foamed aluminum projectile impact loading

Using a gas gun driven high-speed aluminum metal foam projectile,we investigated experimentally the dynamic responses of the solid steel plate,the aluminum matrix syntactic foam sandwich panel and the aluminum foam sandwich panel,whose front and back plates made both from the Q235 steel,under the impact loading.The experimental results showed that using metal foam projectile impact can simulate the explosion load,that the deformation of the sandwich panel can be divided into two stages,i.e.the core compression and the global deformation,and that the shock resistance of the aluminum matrix syntactic foam sandwich panel is stronger than that of the solid steel plate and the aluminum foam sandwich panel.Based on the experiments,we also performed the corresponding finite element simulations using the LS-DYNA software.The simulation results showed that the velocity and the length of the metal foam projectile have obvious effect on the contact force,revealing a linear relationship.The core foam's strength has an obvious effect on the equal-mass and equalthickness sandwich panel's shock-resistance behaviors.As the sandwich panel's deflection is sensitive to the thickness of the front and the back plate,the deflection of the panel will decrease if the thickness of the back plate is bigger than that of the front plate.The recommended material for the plate should be of low stiffness,high ductility and high tensile fracture strain.