Bio-inspired space-filling fractal metamaterial

IF 3.3 2区 医学 Q2 ENGINEERING, BIOMEDICAL Journal of the Mechanical Behavior of Biomedical Materials Pub Date : 2024-10-29 DOI:10.1016/j.jmbbm.2024.106791
Tiantian Li, Yaning Li
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Abstract

Inspired by mammal cranial sutures with spatiotemporal morphological variation, two-phase space-filling fractal metamaterial was designed. Designs with different levels of complexity are fabricated via multi-material polymer jetting. Mechanical tests and systematic finite element (FE) simulations are conducted to evaluate the mechanical performance of the designs. It is found that the hierarchical number N of two-phase space-filling fractal metamaterial played an important role in their mechanical behaviors. The experimental results show that with increasing the hierarchical number N, these metamaterials show enhanced stiffness, strength, and toughness under tensile tests. From the simulation results, we found by decoupling the strain energy density in two phases, with increasing N, the soft phase has contributed almost the same energy level, however, the hard phase has contributed increasing energy level. Moreover, we found the volume fraction and the stiffness ratio of the hard phase dominate the overall mechanical properties of these two-phase space-filling fractal metamaterial. The bio-inspired mechanical metamaterials have broad applications in engineering materials for dissipating energy dissipation, mitigating impact, and retarding damages.
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受生物启发的空间填充分形超材料。
受哺乳动物颅骨缝线时空形态变化的启发,设计了两相空间填充分形超材料。通过多材料聚合物喷射制造出不同复杂程度的设计。通过机械测试和系统的有限元(FE)模拟来评估设计的机械性能。研究发现,两相空间填充分形超材料的分层数 N 对其力学行为起着重要作用。实验结果表明,随着分层数 N 的增加,这些超材料在拉伸试验中表现出更高的刚度、强度和韧性。从模拟结果中,我们发现通过解耦两相的应变能密度,随着 N 的增加,软相贡献的能级几乎不变,但硬相贡献的能级却在增加。此外,我们还发现硬相的体积分数和刚度比主导着这些两相空间填充分形超材料的整体力学性能。受生物启发的机械超材料在工程材料中具有广泛的应用前景,可用于耗散能量、减轻冲击和延缓损伤。
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来源期刊
Journal of the Mechanical Behavior of Biomedical Materials
Journal of the Mechanical Behavior of Biomedical Materials 工程技术-材料科学:生物材料
CiteScore
7.20
自引率
7.70%
发文量
505
审稿时长
46 days
期刊介绍: The Journal of the Mechanical Behavior of Biomedical Materials is concerned with the mechanical deformation, damage and failure under applied forces, of biological material (at the tissue, cellular and molecular levels) and of biomaterials, i.e. those materials which are designed to mimic or replace biological materials. The primary focus of the journal is the synthesis of materials science, biology, and medical and dental science. Reports of fundamental scientific investigations are welcome, as are articles concerned with the practical application of materials in medical devices. Both experimental and theoretical work is of interest; theoretical papers will normally include comparison of predictions with experimental data, though we recognize that this may not always be appropriate. The journal also publishes technical notes concerned with emerging experimental or theoretical techniques, letters to the editor and, by invitation, review articles and papers describing existing techniques for the benefit of an interdisciplinary readership.
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