Study of Mechanical Properties of Thin-Walled MHSS under Compression
薄壁金属空心球结构压缩力学性能研究

Metallic hollow sphere structure (MHSS) is a new type of super-light cellular metallic material. Quasi-static uniaxial compression experiment for sphere array components composed of two or three metallic hollow spheres packed or glued together was conducted. Structure deformation in compression process was observed and analyzed and the yield stress/buckling limit, effective elastic modulus and effective stress-strain curve were obtained respectively. The reason for yield/buckling occurrence was discussed. Three types of boundary conditions were put forward based on experimental phenomenon; the formula of effective elastic modulus was derived analytically, its prediction is basically consistent with experimental data. The mechanical properties and buckling patterns were studied for two types of MHSS face components. Its specific stiffness and specific energy absorption were analyzed. Deformation characteristics and advantages of two types of face components were discussed. It is found that HC packing type has better mechanical properties than that of SC packing type. In addition, effective elastic modulus of SC packing type is contrasted for three sphere arrays. It is found that the effective elastic modulus is just connected with packing accumulation layers.