泡沫铝填充非等长双方管的轴向压溃特性研究  

Axial compression characteristic of non-equal length double square tube structures filled with aluminum foam

作　　者：汪高飞 张永亮[1] 郑志军[1] 叶坚 秦玉林 柯俊 虞吉林[1] WANG Gaofei;ZHANG Yongliang;ZHENG Zhijun;YE Jian;QIN Yulin;KE Jun;YU Jilin(CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Modern Mechanics,University of Science and Technology of China,Hefei 230026,China;Chery Automobile Co.,Ltd.,Wuhu 241009,China)

机构地区：[1]中国科学技术大学近代力学系中国科学院材料力学行为和设计重点实验室,合肥230026 [2]奇瑞汽车股份有限公司,安徽芜湖241009

出　　处：《振动与冲击》2021年第24期90-98,共9页Journal of Vibration and Shock

基　　金：新能源汽车暨智能网联汽车创新工程项目;国家自然科学基金(11772330)。

摘　　要：泡沫铝填充双管结构在轴向压缩下的初始峰值力突出,在作为吸能元件时未能有效地起到保护作用。在双管填充结构的基础上,提出了一种采用非等长双管填充结构降低初始峰值力的方法,建立了具有不同内管长度的泡沫铝填充双方管结构的有限元模型,研究了内管长度对吸能过程的影响。结果表明,与等长双管填充结构相比,非等长双管填充结构的初始压溃峰值可大幅度降低约37%,初始峰值力与平均力之比从1.9下降到1.4,且平台力不会受到明显影响。通过分析泡沫铝、内管和外管之间的相互作用,获得了双管填充结构峰值载荷与材料/结构参数之间的关系。内外管非等长设计可以提高泡沫铝填充双管结构冲击载荷的稳定性和可控性,可为压溃力稳定的吸能器设计提供指导。Foam-filled double tubes under axial compression have high values of initial buckling force and when used as energy-absorbing components they may not effectively play a protective role.A method was proposed to reduce the initial buckling force of the foam-filled double tubes by reducing the length of the inside tube.Finite element analysis was performed on the mechanical behavior of the new structures with different lengths of inner tubes under quasi-static axial compression.The effect of the length of the inner tube on the energy absorption process was analyzed.The results show that the initial buckling force of the new structure can be reduced by 37%,the ratio of the initial buckling force to the mean force is reduced from 1.9 to 1.4 and the plateau force is almost unchanged.The interaction among aluminum foam,the inner tube,and the outer tube was analyzed,and the relationship between the peak initial buckling force and the material and structural properties of the foam-filled double tubes was obtained.The non-equal length design of the inner and the outer tubes can improve the stability and controllability of the impact force of the foam-filled double tubes,and provide guidance for the design of energy absorbers with stable compressive load.

关 键 词：泡沫铝 填充结构 双管构型 初始压溃峰值 相互作用 

分 类 号：TB383[一般工业技术—材料科学与工程]