摘要
该文研究了简单立方排布(SC)、体心立方排布(BCC)以及面心立方排布(FCC)三维空心球泡沫的冲击动力学特性,讨论了不同点阵结构对具有密度梯度的三维金属空心球(MHS)泡沫动态性能的影响。研究结果表明,空心球排布结构的不同,改变了局部空心球的受力情况和变形模式(两球压缩模式和五球压缩模式以及二者之间的转化)。面心立方排布MHS泡沫单位质量的能量吸收率高于体心立方和简单立方排布MHS泡沫。同时,面心立方排布的3D结构更敏感于空心球阵列密度的变化。该文的研究将为多孔材料冲击动力学性能的多目标优化设计方面提供新的设计思路。
In this paper,the dynamic properties of 3D metal hollow sphere（MHS） foams with simple cubic lattice,body-centred cubic lattice or face-centred cubic lattice are studied to investigate the influence of the lattice structures.The results show that the variation of the lattices changes the force and deformation modes of the spheres（two-ball model,five-ball model and transformation between them）.The MHS foams with FCC lattice show great capability of energy absorption.Moreover,the MHS foams with FCC lattice are more sensitive to the variation of the density gradient.The results provide some theoretical guidance on the multi-objective optimization design of impact dynamic properties of porous materials.
出处
《工程力学》
EI
CSCD
北大核心
2011年第12期213-220,共8页
Engineering Mechanics
基金
国家自然科学基金项目(10672018
10972028)
