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铝蜂窝结构单向压缩、失稳和破坏机制研究
引用本文:王飞,李剑荣,虞吉林.铝蜂窝结构单向压缩、失稳和破坏机制研究[J].力学学报,2001,33(6):741-748.
作者姓名:王飞  李剑荣  虞吉林
作者单位:中国科学技术大学力学与机械工程系,
基金项目: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.
摘    要:采用结构代表胞元模型数值模拟了在没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 拗观力学机制,计算了结构代表胞元开始失稳分岔时的宏观应力σT,其值与有限元数值计算和实验得到的结构宏观极限应力σu一致吻合。

关 键 词:  蜂窝结构  材料  代表胞元  胞壁梁  失稳分岔  塑性崩塌  单向压缩  失稳  破坏机制
修稿时间:2000年10月24

A STUDY OF INSTABILITY AND COLLAPASE OF ALUMINUM HONEYCOMBS UNDER UNIAXIAL COMPRESSION
Wang Fei,Li Jianrong,Yu Jilin.A STUDY OF INSTABILITY AND COLLAPASE OF ALUMINUM HONEYCOMBS UNDER UNIAXIAL COMPRESSION[J].chinese journal of theoretical and applied mechanics,2001,33(6):741-748.
Authors:Wang Fei  Li Jianrong  Yu Jilin
Abstract: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.
Keywords:aluminum honeycomb  representative unit cell (RUC)  instability  bifurcation  plastic collapse
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