Energy absorption of bio-inspired multi-layered graded foam-filled structures under axial crushing
Energy absorption of bio-inspired multi-layered graded foam-filled structures under axial crushing
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DOI：
10.1016/j.compositesb.2020.108216
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发表时间：
2020-10
影响因子：
13.1
通讯作者：
X. Xiang;S. Zou;N. Ha;G. Lu;I. Kong
中科院分区：
文献类型：
--
作者：
X. Xiang;S. Zou;N. Ha;G. Lu;I. Kong
本文提出了一种模仿人体骨骼特征的仿生多层梯度泡沫填充结构（MGFS），以提高能量吸收性能。所提出的结构由三层不同密度的泡沫铝填充在三个同心的铝圆管。为了找出最佳的泡沫填充组合，并证明所提出的结构的上级能量吸收性能，一系列的准静态压缩试验进行了实验和数值模拟。结果表明，该结构的吸能效率高于均匀填充泡沫结构和空管结构，泡沫密度从内管到外管逐渐增加的模型1是最佳组合方式。模型1的参数化数值研究表明，铝管直径、厚度和泡沫铝密度对吸能特性有显著影响。最后，建立了一个理论模型，预测的平均破碎力的生物启发MGFS，这是符合实验结果。该研究为设计高吸能效率的泡沫吸能器提供了有效的指导。
In this paper, an innovative bio-inspired multi-layered graded foam-filled structure (MGFS) mimicking the characteristics of the human skeleton was proposed in an attempt to improve the energy absorption. The proposed structures consisted of three layers of aluminum foam with different densities filled in three concentric aluminum circular tubes. To find out the optimal foam-filled combination and demonstrate the superior energy absorption performance of the proposed structures, a series of quasi-static compression tests were experimentally and numerically carried out. The results showed the proposed structures had higher energy absorption efficiency than that of both uniform foam-filled structures and the empty tubes, and Model-1 with the foam density increasing from the inner tube to the outer tube was the best combination mode. Furthermore, parametric numerical studies on Model-1 revealed that the diameter and thickness of the aluminum tube and the density of the aluminum foam had significant effects on the energy absorption characteristics. Finally, a theoretical model was developed to predict the mean crushing force of the bioinspired MGFS, which was in good agreement with the experimental results. This study provides an effective guideline for designing a foam-filled energy absorber with high energy absorption efficiency.