摘要
采用结构代表胞元模型数值模拟了在不同相对密度范围的单型铝蜂窝结构在单向压缩过 程中的变形、失稳和破坏现象．我们推广了转角刚度方法，并结合数值模拟结果分析了结构失 稳和破坏的三种不同特征及相应的细观力学机制，计算了结构代表胞元开始失稳分岔时的宏观 应力，其值与有限元数值计算和实验得到的结构宏观极限应力一致吻合．
The model of representative unit cell (RUC) is used to numerically simulate the deformation, instability and collapse of single-mode aluminum honeycombs under uniaxial compression. The rotation stiffness method is generalized to incorporate the elastic-plastic analysis of cell walls. By applying the method into our numerical analysis, we find three different types of mechanical characteristics of aluminum honeycombs when loss of stability and collapse happen. The corresponding meso-mechanisms, which are closely related to the relative density of the aluminum honeycomb, are then analyzed to explain these characteristics. The calculated critical macroscopic stress of RUC at the initiation of instability and bifurcation, , is therefore introduced and calculated, which coincides well with the macroscopic limit stress obtained by numerical calculation as well as experiments of the aluminum honeycombs under uniaxial compression.
出处
《力学学报》
EI
CSCD
北大核心
2001年第6期741-748,共8页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金(1 0072059)
中国科学院"九五"基础研究重大项目(KJ951-1-201)资助课题.
