泡沫铝夹芯结构抗冲击性能数值模拟

Numerical simulation of impact resistance of aluminum foam sandwich structures

采用ABAQUS软件创建了泡沫铝夹芯结构材料的Voronoi几何模型,研究了子弹冲头初始速度、泡沫铝夹芯层孔隙率、上下面板材料的选择对泡沫铝夹芯结构抗冲击性能的影响。模拟分析发现,随弹丸冲头初始速度升高泡沫铝夹芯结构的吸能会增加,整体的峰值承载力也会变高,在抗冲击的选择上,上板薄下板厚的结构是更加科学的;弹丸冲头冲击能量不变的情况下,不同孔隙率的夹芯结构呈现出承载力与吸能状况都与孔隙率成反比的情况;使用纯铝作为夹芯面板时,夹芯层的吸能占比会高于使用铝合金作为夹芯面板。

Using ABAQUS software,a Voronoi geometric model of aluminum foam sandwich structure material was created to study the effects of the initial velocity of the bullet head,porosity of the aluminum foam sandwich layer,and the choice of materials for the upper and lower panels on the impact resistance of the aluminum foam sandwich structure.Simulation analysis found that as the initial velocity of the bullet head increases,the energy absorption of the aluminum foam sandwich structure increases,and the overall peak bearing capacity also becomes higher.In terms of impact resistance,a structure with a thinner upper panel and a thicker lower panel is more scientific.When the impact energy of the bullet head remains constant,sandwich structures with different porosity levels show that both the bearing capacity and energy absorption are inversely proportional to the porosity rate.When pure aluminum is used as the sandwich panel,the energy absorption proportion of the sandwich layer will be higher than when aluminum alloy is used as the sandwich panel.