Mechanical metamaterials exhibit unusual mechanical properties that originate from their topological design. Origami graphene may provide a platform for constructing novel carbon nanostructures. In the current study, a novel composite material that incorporates aligned graphene with localized origami shapes into the copper matrix is designed. Unlike many auxetic materials that have void phase, the proposed layer‐by‐layer assembled composite material appears to be solid in the microscopic scale. Based on the molecular dynamics (MD) simulations, it is observed that depending on the origami shapes, the in‐plane Poisson's ratio of origami graphene reinforced copper (100) composites can be tuned from positive to negative and, more importantly, it is discovered that the Young's modulus of the graphene/Cu composites can also be tuned from positive to negative in certain in‐plane directions.

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基于石墨烯的超材料中可调整的正/负杨氏模量

机械超常材料表现出不寻常的机械性能，这些性能来自于其拓扑设计。折纸石墨烯可为构建新型碳纳米结构提供平台。在当前的研究中，设计了一种新颖的复合材料，该材料将具有局部折纸形状的定向石墨烯结合到铜基质中。与许多具有空隙相的膨胀材料不同，拟议的逐层组装的复合材料在微观尺度上似乎是固体。基于分子动力学（MD）模拟，可以观察到，根据折纸形状，折纸石墨烯增强铜（100）复合材料的面内泊松比可以从正值调整为负值，更重要的是，发现了它那年轻的