多孔金属夹层板在冲击载荷作用下的动态响应

DYNAMIC RESPONSE OF CELLULAR METALLIC SANDWICH PLATES UNDER IMPACT LOADING

借助两种有限元软件ABAQUS和LS_DYNA,模拟和分析了两种厚度不同的泡沫铝合金夹层板(三明治板)、方孔蜂窝形夹层板和波纹形夹层板在冲击载荷下的动态响应.4种夹层板的单位面积密度相同,冲击载荷分别用泡沫铝子弹与不锈钢子弹模拟.讨论了泡沫金属夹层板和格构式夹层板在不同冲击载荷作用下的变形机制,重点在于对夹层板的吸能特性及板内各部分吸能变化规律的探讨.研究结果表明:在泡沫子弹冲击下,夹层板主要是通过自身变形来消耗子弹动能,并转化为自身内能.厚度为22 mm的泡沫金属夹层板吸收能量最多,底面变形最小,是结构性能最优的夹层板;在刚性子弹高速冲击穿透过程中,格构式夹层板的吸能性能比单位面积密度相同的泡沫金属夹层板的吸能性能更好.波纹形夹层板的能量吸收能力在4种板中最高.

The steel plate - cellular metallic core sandwich construction is a new type of composite sandwich plate for protective applications. We study in this paper the shock resistance of this sandwich structure under impact loading by using two different finite element codes： ABAQUS and LS_DYNA. The dynamic response of the all-metallic sandwich having three different types of core topology： aluminum foam core, square honeycomb core and corrugated core is simulated and analyzed. The effect of varying core thickness is also investigated. The four kinds of sandwich plates have the same density per unit area. The focus is placed upon on the energy absorption capabilities of different sandwich plates having the same density per unit area. Results of the study indicate that sandwich plate with 22 mm aluminum foam core is an excellent sandwich structure with strongest energy absorption capability and smallest deflection in all-metallic sandwich plates by loading the plates with metal foam projectiles. Further, it is found that the sandwich plates with lattice cores have a higher shock resistance than sandwich plates with metallic foam cores of equal mass under penetration impact of rigid bullet.