多孔金属夹芯结构的抗爆性能研究

多孔金属夹芯结构已被广泛应用于航空航天等领域,研究其抗爆吸能性能具有十分重要的意义。分别对金属空心小球和泡沫铝两种夹芯壳结构在TNT爆炸载荷作用下的抗爆性能进行爆炸实验,并采用AN-SYS/LS-DYNA有限元软件进行数值模拟研究。结果表明:金属空心小球夹芯结构作为抗爆吸能结构是可行的;在结构框架尺寸与质量相同时,内面板厚外面板薄的夹芯结构具有更好的抗变形能力,内面板薄外面板厚的夹芯结构则具有更好的吸能特性;在结构框架尺寸与质量相同时,负梯度夹芯结构、并列型小球夹芯结构、小半径小球夹芯结构具有更好的抵抗爆炸载荷和吸收冲击能量的性能;在结构框架尺寸与质量相同时,金属空心小球夹芯结构的整体强度更高,而泡沫铝夹芯结构能更充分地发挥芯层的缓冲性能。

The Dynamic Response of Sandwich Structures with Cellular Metallic Core under Blast Loading

To investigate the blast resistance of sandwich structures with cellular metallic core, the dynamic response of sandwich structures with MHS(metal hollow sphere)and aluminum foams were studied both experimentally and numerically by employing ANSYS/LS-DYNA. Experimental results prove that sandwich structure with MHS can be used to resist blast. According to the parametric studies, the sandwich structures with thin inner face sheet and thick outer face sheet have stronger blast resistance than others. Comparison between sandwich structures with metal hollow spheres and those with aluminum foams was studied experimentally and numerically and the results demonstrate that structures with aluminum foam have advantage over the other in most cases. Also the results show that sandwich structures with interlaced hollow spheres have a better performance than those with paratactic hollow spheres. Moreover, it''s inferred that the density graded core with the biggest density as the first impact layer and the least density as the last layer has more benefits in energy absorption. The conclusions are referable in the optimization of sandwich structures.