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对低密度闭孔金属泡沫的变形过程进行数值模拟是研究泡沫材料力学及失效行为的重要手段.基于Kelvin多倍胞体模型和有限元方法数值模拟了低密度闭孔泡沫铝的压缩变形的过程,给出了压缩变形曲线并确定了压缩屈服强度.在计算过程中,考虑了材料非线性和几何非线性效应以及胞体倍数对应力-应变关系的影响,并采用理想弹-塑性和线性强化弹-塑性两种材料本构关系来考察其对于泡沫铝非线性压缩力学行为的影响.结果表明,有限元计算的结果与一些文献的理论工作有较好的一致性,但是比实验值偏大.
The numerical simulation of the deformation process of low density closed-cell metal foam is an important means to study the mechanical behavior and failure behavior of foam.The numerical simulation of the compressive deformation of low-density closed-cell aluminum foam based on Kelvin polycyclic body model and finite element method, The compressive deformation curve is given and the compressive yield strength is determined.In the calculation process, the effects of material nonlinearity and geometric nonlinearity as well as cell body multiples on the stress-strain relationship are considered, and the ideal elastic-plastic and linear- Plasticity of the two materials to investigate their effect on the nonlinear compressive behavior of foamed aluminum.The results show that the results of finite element analysis are in good agreement with the theoretical work of some literatures but are larger than the experimental ones.