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中文摘要：
利用面心立方单元胞模型计算了球形闭孔泡沫金属材料的宏观弹塑性特性，建立了弹性参数和屈服强度与相对密度的关系，所得结果与球形（类球形）闭孔泡沫铝合金试验结果进行了比较，二者吻合较好．此外，利用所建立的单元胞模型计算了等比例多轴载荷下的应力-应变曲线，针对现有的泡沫金属材料弹塑性宏观唯象本构框架，得到了球形孔闭孔泡沫金属材料在不同特征应变下应力势函数曲面及其演化规律，确定了其宏观本构理论模型的材料参数．结果表明，该理论模型能较好模拟有限元数值计算结果．
英文摘要：
Face-centered cubic unit cell model is employed to investigate the macroscopic elasto-palstic behaviors of closed-cell foams with spherical pores. The dependence of the elastic constants and yield strength of the foams on the relative density are calculated and are found to agree with the experimental results. The stress-strain curves under proportional triaxial loadings are also simulated. They are then used to determine the material parameters in a phenomenological elastoplastic model. The so-determined phenomenological model is found to be able to predict the numerically calculated characteristic stress-strain curves, with good agreement achieved.
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