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yexuqing木虫之王 (文学泰斗)
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3D polycatenated architected
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3D polycatenated architected 3D聚链化建筑材料 ▲ 作者：WENJIE ZHOU, SUJEEKA NADARAJAH, LIUCHI LI, ANNA GUELL IZARD, HUJIE YAN, AASHUTOSH K. PRACHET, PAYAL PATEL, XIAOXING XIA, AND CHIARA DARAIO ▲链接： https://www.science.org/doi/10.1126/science.adr9713 ▲摘要： 建筑材料的特性来源于其内部结构元素的几何排列。他们的设计依靠连续的成员网络来控制整体的力学行为。研究者介绍了一类由离散的连接环或笼状颗粒联锁在三维网络中组成的材料，形成多联结构材料（PAM）。他们提出了一个通用的设计框架，将任意晶体网络转化为粒子连接和几何形状。 在响应小的外部载荷时，PAM表现得像非牛顿流体，表现出剪切变薄和剪切增厚的响应，这可以通过它们的阳离子拓扑结构来控制。在较大的应变下，PAM表现为晶格和泡沫，具有非线性应力—应变关系。在微观尺度上，研究证明了PAM可以改变其形状以响应施加的静电荷。PAM的独特特性为开发刺激响应材料、能量吸收系统和变形结构铺平了道路。 ▲ Abstract： Architected materials derive their properties from the geometric arrangement of their internal structural elements. Their designs rely on continuous networks of members to control the global mechanical behavior of the bulk. In this study, we introduce a class of materials that consist of discrete concatenated rings or cage particles interlocked in three-dimensional networks, forming polycatenated architected materials (PAMs). We propose a general design framework that translates arbitrary crystalline networks into particle concatenations and geometries. In response to small external loads, PAMs behave like non-Newtonian fluids, showing both shear-thinning and shear-thickening responses, which can be controlled by their catenation topologies. At larger strains, PAMs behave like lattices and foams, with a nonlinear stress-strain relation. At microscale, we demonstrate that PAMs can change their shapes in response to applied electrostatic charges. The distinctive properties of PAMs pave the path for developing stimuli-responsive materials, energy-absorbing systems, and morphing architectures. |
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