仿生双菱形肋边多胞薄壁结构的耐撞性能研究

为提高汽车吸能盒结构耐撞性，受毛竹微观结构启发，提出3种不同的仿生双菱形肋边多胞薄壁结构。建立仿生双菱形肋边多胞薄壁结构的有限元模型，通过有限元仿真对比研究仿生双菱形肋边多胞薄壁结构与传统八边形多胞薄壁结构的耐撞性。分析双菱形肋边布置方式、内层壁厚等因素对新型薄壁结构吸能特性和变形模式的影响。结果表明，与传统八边形多胞薄壁结构相比，仿生双菱形肋边多胞薄壁结构的吸能特性有了明显的提升；双菱形肋边布置方式和内外层壁厚对结构吸能特性均有一定影响；随着内层壁厚的增加，结构最大峰值力减小，但总能量吸收和比吸能减少，载荷平稳度降低。仿生双菱形肋边多胞薄壁结构能有效降低乘员在汽车正面碰撞中所受的伤害，可应用到新能源汽车吸能盒的设计开发中。

Crashworthiness of Biomimetic Double-Diamond-Ribbed Multi-Cell Thin-Walled Structures

To improve the crashworthiness of automobile energy-absorbing boxes, the paper proposes three different biomimetic double-diamond-ribbed multi-cell thin-walled structures, inspired by the microstructure of bamboo. Initially,the finite element model for these biomimetic structures is established and its impact resistance is compared with that of the traditional octagonal multi-cell thin-walled structure through finite element simulations. Subsequently, the paper analyzes the effects of the arrangement of double-diamond ribs and the thickness of inner walls on the energy absorption characteristics and deformation modes of the novel structures. The results indicate that the biomimetic structures offer significantly better energy absorption than their traditional counterparts. The arrangement of double-diamond ribs and the thickness of both inner and outer walls affect the structural energy absorption characteristics. With the increase in the inner wall thickness, the initial peak force on the structure decreases, but the total energy absorption and specific energy absorption decrease, leading to a reduction in load stability. The proposed biomimetic double-diamond-ribbed multi-cell thin-walled structure effectively reduces the injuries to occupants in frontal vehicle collisions, and can be applied in the design and development of energy-absorbing boxes for new energy vehicles.