Tao Chenglin, Zhou Xin, Liu Zeliang, Liang Xi, Zhou Wentao, Li Huijian
School of Civil Engineering and Mechanics, Yanshan University, Qinhuangdao 066004, China.
Hebei Key Laboratory of Mechanical Reliability for Heavy Equipments and Large Structures, Yanshan University, Qinhuangdao 066004, China.
Materials (Basel). 2023 Feb 24;16(5):1871. doi: 10.3390/ma16051871.
Based on the advantages of thin-walled tubes and lattice structures in energy absorption and improved crashworthiness, a hybrid structure of lattice-reinforced thin-walled tubes with different cross-sectional cell numbers and gradient densities was constructed, and a high crashworthiness absorber with adjustable energy absorption was proposed. The experimental and finite element characterization of the impact resistance of uniform density and gradient density hybrid tubes with different lattice arrangements to withstand axial compression was carried out to investigate the interaction mechanism between the lattice packing and the metal shell, and the energy absorption of the hybrid structure was increased by 43.40% relative to the sum of its individual components. The effect of transverse cell number configuration and gradient configuration on the impact resistance of the hybrid structure was investigated, and the results showed that the hybrid structure showed higher energy absorption than the empty tube, and the best specific energy absorption was increased by 83.02%; the transverse cell number configuration had a greater effect on the specific energy absorption of the hybrid structure with uniform density, and the maximum specific energy absorption of the hybrid structure with different configurations was increased by 48.21%. The gradient density configuration had a significant effect on the peak crushing force of the gradient structure. In addition, the effects of wall thickness, density and gradient configuration on energy absorption were quantitatively analyzed. This study provides a new idea to optimize the impact resistance of lattice-structure-filled thin-walled square tube hybrid structures under compressive loading through a combination of experiments and numerical simulations.
基于薄壁管和晶格结构在能量吸收和提高抗撞性方面的优势，构建了具有不同横截面胞元数量和梯度密度的晶格增强薄壁管混合结构，并提出了一种能量吸收可调节的高抗撞性吸能器。对具有不同晶格排列的均匀密度和梯度密度混合管承受轴向压缩的抗冲击性进行了实验和有限元表征，以研究晶格填充与金属壳之间的相互作用机制，混合结构的能量吸收相对于其各组成部分之和提高了43.40%。研究了横向胞元数量配置和梯度配置对混合结构抗冲击性的影响，结果表明，混合结构比空管具有更高的能量吸收，最佳比能量吸收提高了83.02%；横向胞元数量配置对均匀密度混合结构的比能量吸收影响更大，不同配置混合结构的最大比能量吸收提高了48.21%。梯度密度配置对梯度结构的峰值挤压力有显著影响。此外，还定量分析了壁厚、密度和梯度配置对能量吸收的影响。本研究通过实验和数值模拟相结合，为优化压缩载荷下晶格结构填充薄壁方管混合结构的抗冲击性提供了新思路。
