复杂截面多胞金属薄壁结构轴向压缩阻抗研究

轻质多胞金属薄壁结构具有良好的力学和能量吸收性能，在工程结构安全防护领域具有广泛的应用前景。本项目针对复杂截面多胞金属薄壁结构的轴向压缩阻抗问题，以整体结构的基本构成元素- - 不同类型的基本单元为主要研究对象，采用理论分析、数值模拟、实验研究及优化设计相结合的研究方法，研究各类基本单元在发生各种可能的变形模式情况下的变形机理和能量吸收性能，分析主要结构参数对基本单元变形模式的影响，建立与变形模式相对应的理论分析模型并确定各类基本单元能量耗散的理论预测方法。项目预期将揭示轴压后屈曲变形条件下各类基本单元的内在塑性变形机理，建立复杂截面多胞金属薄壁结构轴向压缩性能的系统化分析方法，获得相关截面的最优化设计规律。项目的研究成果将为多胞金属薄壁结构的耐撞性设计提供理论依据，并为进一步提高其能量吸收效率提供新的方法和思路。

Lightweight multi-cell thin-walled metallic structures possess excellent mechanical and energy absorption properties and have extensive application prospects in the field of safety and protection of engineering structures. This project aims to solve the crushing resistance of multi-cell thin-walled metallic structures with complex cross sections under axial compression by dividing the whole structures into different types of basic elements and studying the crushing behavior of these basic elements. Theoretical analysis, numerical simulation, experimental investigation and structural optimization will be carried out to study the deformation mechanisms and energy absorption characteristics of basic elements developing various possible deformation modes. The influences of structural parameters on the deformation modes of basic elements will be investigated and theoretical models will be developed for corresponding deformation modes to predict the energy dissipation of the basic elements. The project is expected to disclose the intrinsic plastic deformation mechanisms of post-buckling behavior of various basic elements under axial compression, to establish the systematic analysis method to predict the compression property of multi-cell thin-walled metallic structures with complex cross sections, and to obtain the principles of optimal design of relevant structures. The research results of the project will not only sever as theoretical basis for the crashworthiness design of multi-cell thin-walled metallic structures, but also provide new approaches and ideas to further improve the energy absorption efficiency of the structures.