Numerical Simulation of Multiaxial Creep Behavior of 2D Anisotropic Cellular Materials

Based on the Voronoi model of 2D anisotropic cellular materials, the uniaxial and multiaxial creep behaviors were systematically studied. A large number of numerical simulation results showed that the mechanical properties of the 2D anisotropic cellular materials are greatly dependent on the geometric tensile coefficient R, which represents the degree of anisotropy. Among them, the values of the parameters r₁ and $\nu_{12}$ gradually increase with the increase of R, and the change rule of the parameter r₂ is just the opposite. For 2D anisotropic cellular materials, with the increase of R, the uniaxial steady-state creep rate along the tensile direction increases, while the performance in the other direction decreases gradually. In addition, based on the relationship between characteristic stress and characteristic strain, a theoretical model was established, which can describe the multiaxial creep behavior of 2D anisotropic cellular materials. By comparing the prediction results of the model with the numerical simulation results of the steady-state creep rate of materials under different anisotropic degrees and loading conditions, it was found that these two agree well, which proves the validity of the theoretical model established in this paper.