中文摘要：

金属圆管增强复合材料夹芯结构是一种新型的轻质多功能结构。考虑了横向剪切变形对临界载荷的影响,以实验方法测量出夹芯柱的横向剪切刚度,计算出临界屈曲载荷的理论值,并从实验上加以验证。利用有限元分析软件ABAQUS,模拟了夹芯柱宏观屈曲的形式,并与理论值和实验值进行了对比,结果吻合较好。采用数值模拟方法,研究了临界屈曲载荷与金属圆管排布方式之间关系。结果表明：金属圆管增强夹芯柱宏观屈曲主要以横向剪切屈曲为主;临界载荷值随着圆管在长度方向上的间距变小而增大;在圆管总重量和高度不变的情况下,临界载荷随着圆管半径和间距的变小而增大。研究结果对于在轴向压缩载荷下的金属圆管增强夹芯柱设计具有重要的指导意义。

英文摘要：

The composite sandwich structure reinforced by metallic tubes is a novel type of ultra-light multifunctional structure.The calculation of the critical load took the influence of the transverse shear into account,and the transverse shear stiffness of the sandwich column was measured experimentally.The theoretical prediction of the critical load was validated by test.The buckling behavior of the composite sandwich column reinforced by metallic tubes was simulated using the finite element software ABAQUS,and the numerical result was well consistent with the theoretical prediction and experimental result.The relation between the critical load and the arrangement of metallic tubes was investigated numerically.The results show that the buckling mode of the composite sandwich column reinforced by metallic tubes is dominated by transverse shear buckling;the critical load increases with the decrease of the spacing of tubes along the longitudinal direction;keeping the height and total mass of tubes fixed,decreasing the radius and the spacing of metallic tubes can increase the critical load.The results are valuable for the design of the sandwich column reinforced by metallic tubes under longitudinal compressive load.