Dual-phase mechanical metamaterials, fabricated as a hybrid of two architected lattice materials with different mechanical properties and bioinspired patterning, have been shown to exhibit improved combination of properties, such as enhanced reinforced strength and toughness. In this study, we specifically examine the selection of the reinforcement phase, specifically involving the effects of its structural architecture, in terms of connectivity and interfacial structure, on the resulting mechanical properties and deformation mechanisms of such dual-phase lattice composites. The composites are simply fabricated using selected laser melting based additive manufacturing. Using quasi-static compression tests and simulation studies, we find that enhancing the role of the reinforcement phase (RP), connection phase (CP) and their interfaces, by employing more trusses distributed along the loading direction, can dramatically improve mechanical properties and energy absorption. By such architectural design of the connection phase, the specific stiffness, specific strength, and specific energy absorption of the dual-phase lattice composites can be optimized, respectively by 77%, 7% and 51% compared to the unreinforced matrix phase lattices. This suggests that the design space of mechanical metamaterials can be significantly expanded by architectural and phase selection together with bioinspired phase patterning.

双相机械超材料由具有不同机械性能和仿生图案的两种结构晶格材料混合而成，已被证明具有改进的性能组合，例如增强的强度和韧性。在这项研究中，我们专门研究了增强相的选择，特别是涉及其结构结构的影响，在连通性和界面结构方面，对这种双相晶格复合材料的机械性能和变形机制的影响。复合材料是使用选定的基于激光熔化的增材制造来简单制造的。使用准静态压缩测试和模拟研究，我们发现增强增强相 (RP)、连接相 (CP) 及其界面的作用，通过采用更多沿加载方向分布的桁架，可以显着提高机械性能和能量吸收。通过这种连接相的结构设计，双相晶格复合材料的比刚度、比强度和比能量吸收比未增强的基体相晶格分别优化了77%、7%和51%。这表明机械超材料的设计空间可以通过结构和相位选择以及仿生相位图案化来显着扩展。与未增强的基体相晶格相比，双相晶格复合材料的比能量吸收和比能量吸收可以分别优化 77%、7% 和 51%。这表明机械超材料的设计空间可以通过结构和相位选择以及仿生相位图案化来显着扩展。与未增强的基体相晶格相比，双相晶格复合材料的比能量吸收和比能量吸收可以分别优化 77%、7% 和 51%。这表明机械超材料的设计空间可以通过结构和相位选择以及仿生相位图案化来显着扩展。