板状立方点阵超结构填充汽车吸能盒的抗冲击吸能特性

Impact energy-absorption performances of an automobile energy-absorbing-box with plate cubic-lattice core filled

为满足汽车轻量化设计对吸能结构的要求,进行了板状立方点阵力学设计及冲击吸能研究。设计出简单立方(SC)、体心立方(BCC)、面心立方(FCC)3种板状立方基本胞元,及其组合SCBCC、SC-FCC 2种组合胞元。对BCC、FCC、SC-BCC、SC-FCC等4种板状点阵结构变形机制、力学响应进行了系统分析,将4种结构在10、50 m/s冲击速度下吸能特性进行评估对比。结果显示:板状立方点阵结构填充吸能盒低速冲击下峰值载荷低于100 kN,其平均载荷与峰值载荷近乎相等,组合胞元填充吸能盒比吸能(SEA)高于32 J/g。板状立方点阵结构较传统吸能盒具有优良的抗冲击和吸能特性,在轻量化汽车被动防护领域有广阔应用前景。

In order to meet the higher requirements of energy absorbing structure in the lightweight design of automobile,the mechanical design and impact energy absorption of plate cubic lattice are studied.Three kinds of basic cell structures of the plate-like cube,simple cube(SC),body centered cube(BCC)and face centered cube(FCC)are designed,and two composite cell structures SC-BCC,SC-FCC are obtained by combining the basic cells.The deformation mechanism and mechanical response of BCC,FCC,SC-BCC and SC-FCC lattice structures are analyzed systematically,and the energy absorption performance of four structures under 10 and 50 m/s impact velocity are evaluated and compared.The results show that the peak load of the energy absorbing box filled with plate cubic-lattice core is less than 100 kN under 4.4 m/s impact,and the average load is almost equal to the peak load,and the specific energy absorption(SEA)of the composite lattice core filled energy absorption box is higher than 32 J/g.Comparative study found that the plate-like cubic lattice has excellent impact resistance and energy absorption characteristics,and has a broad application prospect in the field of lightweight automobile passive protection.