关键词: 金属橡胶, 各向异性, 数值动态重构, 空间几何拓扑, 微观摩擦机理

Abstract: Metal rubber is an anisotropic porous material, whose constitutive characteristics are often obtained by artificial experience or experiment. The complex spiral network structure in metal rubber cannot be understood by testing methods. Therefore, virtual fabrication technology and numerical dynamic reconstruction are developed to explore the spatial topological structure of metal rubber and the mechanism of contact friction between wire turns, and further explain the anisotropic mechanical behavior of metal rubber on the macro level combined with the micro morphology of materials in Scanning electron microscope (SEM). By introducing the concept of wire turn micro element combination probability distribution and the concept of spatial local pore distribution, the disordered wire turn mesh interpenetrating structure in metal rubber was effectively characterized. Considering the spatial topological structure and micro friction mechanism parameters of metal rubber at meso level, as well as macro preparation parameters including material shape, relative density, wire diameter, helix pitch and elastic modulus of metal wire, an anisotropic constitutive model which can reflect the micro structure characteristics and macro properties of metal rubber is constructed. Compared with the results of quasi-static compression test, the residual analysis was used to verify quantitatively. The results show that:the constitutive model of metal rubber anisotropy proposed can effectively reflect and predict the complex anisotropic mechanical behavior of metal rubber materials, and provide certain theoretical guidance for the in-depth research and application of materials.

Key words: metal rubber, anisotropy, numerical dynamic reconstruction, spatial geometry topology, micro friction mechanism