Additively manufactured high-energy-absorption metamaterials with artificially engineered distribution of bio-inspired hierarchical microstructures
Additively manufactured high-energy-absorption metamaterials with artificially engineered distribution of bio-inspired hierarchical microstructures
复制标题
增材制造的高能量吸收超材料，具有人工设计的仿生分层微结构分布
DOI：
10.1016/j.compositesb.2022.110345
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发表时间：
2022
期刊：
影响因子：
12.8
通讯作者：
Gao Z
中科院分区：
文献类型：
--
作者：
Gao Z
在航空航天工业中，对保护性轻质部件的需求越来越大，而增材制造（AM）的高柔性使得复杂结构的设计能够实现这一目标。在这项研究中，一种新型的高能量吸收球形中空结构（SHS）首次设计了一个逐层的故障模式和晶体启发晶界通过其分层微观结构的变化。为了设计SHS的强度分布，实验研究了具有弯曲为主和拉伸为主的蜂窝状微结构的SHS球形单胞在不同微结构密度下的力学性能。模拟结果进一步揭示了它们的失效机理。基于这些单元胞的微结构密度和力学响应之间的关系，提出了一种失效模式工程方法，通过微结构控制强度分布来人为地控制晶格结构的失效顺序。在这里，我们证明了一个层压失效模式复合材料分级SHS晶格与晶体启发弯曲和拉伸为主的晶粒是使用AM。与密度相似的不同能量吸收材料设计相比，准静态压缩结果表明，分级SHS晶格具有比能量吸收提高72%，由于其介观晶界的约束作用，密度归一化平台应力高出50%，以及密集设计的层压失效水平的数量增加。本文提出了一种新的AM高吸能晶格结构的设计范式，以满足不同的防护应用。
There is an increasing demand of protective lightweight components in aerospace industries, and the high flexibility of additive manufacturing (AM) enables the design of complex structures to achieve such goal. In this study, a novel high-energy-absorption spherical hollow structure (SHS) was first engineered with a layer-wise failure mode and crystal-inspired grain boundaries through the variation of its hierarchical microstructures. To engineer the strength distribution of SHS, the mechanical properties of its spherical unit cells with bending-dominated and stretch-dominated honeycomb microstructures was experimentally studied with respect to different microstructural densities. Simulations were also performed to further reveal their failure mechanisms. Based on the relationship between the microstructural densities and the mechanical responses of these unit cells, a failure mode engineering method was proposed to artificially control the failure sequence of the lattice structure through a microstructural-controlled strength distribution. Here, we demonstrated a laminated failure mode composite hierarchical SHS lattice with crystal-inspired bending and stretch-dominated grains was developed using AM. Compared to different energy-absorption material designs with similar density, the quasi-static compressive results indicated that a hierarchical SHS lattice possesses a 72% improvement in the specific energy absorption, a 50% higher density-normalized plateau stress owing to the constraining effect of its mesoscale grain boundaries, and an increased number of intensively engineered laminated failure levels. This manuscript proposes a new design paradigm of AM high energy-absorption lattice structure for different protective applications.