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金属空心球结构是一种新型的超轻多孔金属材料。本文对直接堆积和胶合堆积的两球、三球金属空心球列组元进行了单轴准静态压缩实验,分析压缩过程的变形情况,得出其应力/屈曲极限、有效弹性模量、有效应力-应变曲线,并讨论了发生屈服/屈曲的原因。基于实验现象作者提出了三种边界条件,通过分析的方法导出列组元的有效弹性模量公式,其预测值与实验结果较为符合。通过对两种不同堆积模式面组元的压缩实验,研究了金属空心球结构的力学性能和垮塌规律,分析其比刚度和比体积能量吸收值,讨论了两种不同堆积模式的面组元的特点和优越性,发现HC堆积模式具有更好的力学性能。同时对比三球列组元的有效弹性模量发现,SC堆积模式的有效弹性模量只与堆积层数有关。
Metal hollow ball structure is a new type of ultra-light porous metal material. In this paper, the uniaxial quasi-static compression experiments of two-sphere and three-sphere metallic hollow sphere elements stacked directly and glued together are carried out. The deformation of the compression process is analyzed, and the stress / buckling limit, effective elastic modulus and effective stress - Strain curve and discusses the reason for yield / buckling. Based on the experimental phenomena, the authors propose three boundary conditions, and derive the formula of effective elastic modulus of column elements by means of analysis. The predicted values are in good agreement with the experimental results. The compressive experiments of two different stacking patterns of surface elements have been carried out to study the mechanical properties and collapse rules of metal hollow spherical structures. The specific stiffness and specific energy absorption of the hollow elements have been studied. The effects of two different stacking modes Characteristics and superiority, it is found that the HC stacking mode has better mechanical properties. Comparing the effective elastic moduli of the three-sphere elements, it is found that the effective elastic modulus of the SC stacking mode is only related to the number of layers deposited.