AI 中文总结
该研究证实非均匀八面体材料在关键组分体积分数下可实现完全弹性各向同性，其各向异性比随组分体积分数变化，且通过3D打印原型验证了该特性。
AI 中文摘要
八面体网络已被广泛用作多种结构材料的基本构建单元。本研究表明，非均匀八面体材料在关键组分体积分数下可实现完全弹性各向同性，且该特性几乎与组分刚度比无关。各向异性比a在关键组分体积分数处从a>1转变为a<1，源于主导变形模式的变化。微观结构分析显示，非均匀八面体材料的几何结构与连通性，与由简单立方（SC）和体心立方（BCC）晶格组合构建的、具有相反弹性各向异性的非均匀材料非常相似。更重要的是，研究证实，改变八面体材料中的组分体积分数可调控弹性各向异性，这与广泛用于设计力学各向同性结构材料的SC-BCC材料中调整BCC与SC的组成比类似。研究还通过3D打印原型进一步评估了非均匀八面体材料的力学各向同性。
英文摘要
An octahedral network has been widely used as a fundamental building block for diverse architected materials. Here, we demonstrate that heterogeneous octahedral materials can achieve complete elastic isotropy at a critical constituent volume fraction, nearly independent of the constituent stiffness ratio. The anisotropy ratio, a, transitions from a > 1 to a < 1 at the critical constituent volume fraction, due to a change in the dominant deformation modes. Microstructural analysis reveals that the geometry and connectivity of the heterogeneous octahedral materials are very similar to those of heterogeneous materials constructed on combined simple cubic (SC) and body-centered cubic (BCC) lattices exhibiting opposite elastic anisotropy. More importantly, we demonstrate that varying the constituent volume fractions in the octahedral materials governs elastic anisotropy, similarly to tuning the BCC-to-SC composition ratio in the SC-BCC materials widely employed for designing mechanically isotropic architected materials. The mechanical isotropy of the heterogeneous octahedral materials is further assessed using 3D-printed prototypes.
Comments21 pages, 9 figures (7 in the main text, 2 in the appendix), 2 tables
