四方蜂窝夹芯圆柱壳在径向压缩载荷作用下的力学行为研究

Mechanical behavior of square honeycomb lattice sandwich cylindrical shell under radial pressure

摘要

通过将金属薄壁管及蜂窝结构相结合，提出了一种四方蜂窝夹芯圆柱壳结构。 通过实验以及有限元分析软件 ABAQUS /Explicit 研究了四方蜂窝夹芯圆柱壳在径向压缩载荷作用下的力学行为。 通过对比验证了有限元模型的准确性，分析了结构在径向压缩载荷作用下的变形模式，探讨了该结构的增强机理。 研究表明，四方蜂窝夹芯圆柱壳结构在径向压缩载荷作用下会经历弹性阶段、塑性阶段和折叠压溃 3 个变形阶段；结构主要通过塑性铰的形成以及芯体褶皱来耗散更多的压溃能；相较于单层圆柱壳及芯体的简单叠加，四方蜂窝夹芯圆柱壳的承载能力和能量吸收都得到提高，且结构主要通过塑性铰的形成进行耦合增强。 进一步参数化讨论结果表明，无量纲芯体壁厚的增加将提高四方蜂窝夹芯圆柱壳的峰值力和比吸能。

Abstract

In order to investigate a structure with better mechanical properties，this paper proposes a square honeycomb lattice sandwich cylindrical shell structure，which combines metal thin-walled tubes and honeycomb structures.The mechanical behavior of the sandwich cylindrical shell structure with a square honeycomb as the core under radial compressive loads is studied by experimental and numerical methods.By comparing the results of two research methods，the accuracy of the finite element model is verified，and the deformation mode of the structure under radial compressive loads is analyzed，and the reinforcement mechanism of the structure is discussed.The results show that the rectangular honeycomb lattice sandwich cylindrical shell structure will undergo three deformation stages：elastic stage，plastic stage and collapsibility stage under radial compression load.Compared with the simple superposition of single-layer cylindrical shells and cores，the load-bearing and energy absorption of the square honeycomb lattice sandwich cylindrical shell are greatly improved.The structure is mainly coupled and reinforced by the formation of plastic hinges and the debonding between the square honeycomb core and the inner and outer cylindrical shells.

关键词

夹芯圆柱壳 / 四方蜂窝 / 径向压缩 / 变形模式 / 耦合增强

Key words

sandwich cylindrical shell / square honeycomb / radial pressure / deformation mode / coupling enhancement

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基金资助

国家自然科学基金资助项目(12102327)