Growth rules for irregular architected materials with programmable properties
Growth rules for irregular architected materials with programmable properties
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DOI：
10.1126/science.abn1459
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发表时间：
2022-08-26
期刊：
影响因子：
56.9
通讯作者：
Daraio, Chiara
中科院分区：
文献类型：
--
作者：
Liu, Ke;Sun, Rachel;Daraio, Chiara
生物材料显示出几何不规则且功能高效的微观结构。了解不规则性在确定材料性能方面的作用，为设计具有卓越功能的材料提供了一条新途径，例如缺陷不敏感、增强的冲击吸收和应力重定向。我们使用增长启发的程序揭示了基本的概率结构-属性关系，该程序引发了自然系统中随机架构的形成。这个虚拟增长计划对有限数量的基本元素施加了一套当地规则。它从非常有限的初始资源出发，生成功能特性表现出巨大变化的材料，这与生物系统的多样性相呼应。我们通过在不规则材料的基于图形的通用表示中独立地改变微观结构的拓扑和几何形状来确定控制机械性能的基本规则。
Biomaterials display microstructures that are geometrically irregular and functionally efficient. Understanding the role of irregularity in determining material properties offers a new path to engineer materials with superior functionalities, such as imperfection insensitivity, enhanced impact absorption, and stress redirection. We uncover fundamental, probabilistic structure-property relationships using a growth-inspired program that evokes the formation of stochastic architectures in natural systems. This virtual growth program imposes a set of local rules on a limited number of basic elements. It generates materials that exhibit a large variation in functional properties starting from very limited initial resources, which echoes the diversity of biological systems. We identify basic rules to control mechanical properties by independently varying the microstructure's topology and geometry in a general, graph-based representation of irregular materials.