Design of Mechanical Auxetic Metamaterial for Heterogeneous Assembly, Programmable Periodic Porous Elastomer Structures

With the development of metamaterials, programmable and assembled auxetic structures have attracted extensive attention due to their unusual mechanical behaviors. In this study, we design a 3D printed metamaterial structure with significantly improved stress and programmable auxetic behavior by means of the cooperativity of viscoelastic and elastic materials. The effects of porosity, temperature, the shape of pore and Young's modulus of the elastic material on the mechanical behavior of 3D printed metamaterial have been characterized using finite element method (FEM) analysis and experimental measurements. The constitutive relationships between stress, strain, porosity and the shape of pore have been formulated to explore the working principles of these parameters in the mechanical performances.