易制备多胞金属薄壁结构吸能特性研究

轻质多胞金属薄壁结构具有良好的力学和能量吸收性能，然而由于制备成本相对较高限制了其在工程结构安全防护领域更为广泛的应用。本项目针对一类低成本、易制备多胞金属薄壁结构的吸能特性进行研究，采用实验研究、数值模拟、理论分析和优化设计相结合的研究方法，探讨新的制备方式对轴向与横向加载条件下多胞薄壁结构的变形模式、塑性变形机理和能量吸收性能的影响，分析主要结构、材料和制备工艺参数对多胞薄壁结构耐撞性指标的影响，建立易制备多胞薄壁结构中常见基本单元轴压阻抗的理论预测方法，开展变厚度多胞结构性能的最优化设计。项目预期将揭示不同载荷条件下易制备多胞薄壁结构的变形特征和能量吸收机理，建立其轴向压缩阻抗的理论分析方法，获得相关结构的最优化设计规律。项目的研究成果将为易制备多胞金属薄壁结构的耐撞性设计提供理论依据，并为其更广泛的工程应用提供技术支撑。

Light weight multi-cell thin-walled metallic structures possess excellent mechanical and energy absorption properties, but the relatively high manufacturing costs restrict the wide applications of them in the field of structural safety protection. This project aims to investigate the energy absorption characteristics of a type of low-cost and easily prepared multi-cell thin-walled structures. Experimental study, numerical simulation, theoretical analysis and optimization design will be employed to study the influence of new fabrication methods on collapse mode, deformation mechanism and energy absorption performance of multi-cell structures under axial and transverse loads. The influences of primary structural, material and fabrication parameters on crashworthiness indices will be investigated. Theoretical models will be established for the axial crush resistance of basic constituent elements in multi-cell structures of this type and design optimization of multi-cell structures with variable thickness will be performed. The project is expected to disclose deformation features and energy absorption mechanisms of easily prepared multi-cell thin-walled structures under various load conditions, to establish analytical methods for axial crush resistance of them, and to obtain the principles of optimization of relevant structures. The research results of the project will sever as theoretical basis for the crashworthiness design of easily prepared multi-cell thin-walled metallic structures and provide technical supports for the wider engineering applications of them.