表面纳米化吸能薄壁多胞结构的数值模拟与设计

Numerical simulation and design on energy absorption for thin wall multicellular structures of the local surface nanocrystallization

采用局部表面纳米化技术和数值模拟方法,对金属薄壁多胞结构的吸能问题开展有限元数值分析和优化设计。结果显示,局部表面纳米化布局可诱导结构的屈曲变形,并能大幅度提高结构的能量吸收。优化结果还发现,在多胞外壁呈交错矩形格状表面纳米化格局和内附加结构呈均布框架式矩形格状表面纳米化布局情况下,结构屈曲变形稳定且吸能效果最优。该研究为吸能结构的设计提供了依据。

Adopting the technology of local surface nanocrystallization and method of numerical simulation,the energy absorption of multicellular thin-walled metal structures is researched by using finite element analysis and optimization design in this paper.Results show that the local surface nanocrystallization can induce buckling deformation of the structures and greatly improve the energy absorption.The results of optimization also show that the buckling deformation of the structures is stable and the effect of energy absorption is optimal under special conditions,in which the outer wall of the multicellular thin-walled structure is distributed by staggered rectangles of nanocrystallization and the inner additional structures are dispersed by framed nanocrystallization of uniformly distributed rectangular shapes.The results and conclusions provide a basis for the design of energy absorption structures.