The feature sizes (the thickness of the metal layer, h, and in-plane grain size, d) as well as their coupling synergistically affect the mechanical properties of nanolaminated graphene/metal composites. However, previous works, including numerical calculations and theoretical models, mainly focused on the effect of one feature size. In this work, we investigated the effect of the feature sizes and their coupling on the mechanical properties of nanolaminated polycrystalline graphene/polycrystalline copper (PGr/PCu) composites under uniaxial compression using molecular dynamics simulation. It was found that h has a significant influence on both the elastic and plastic stage of the PGr/PCu, but the dependence of the plastic stage on d is associated with h, governed by different deformation mechanisms. Accordingly, five dislocation propagation modes were observed in the nanolaminated PGr/PCu composites. Finally, the Hall-Petch and inverse Hall-Petch law and confined layer slip model were extended to quantitatively describe the strengthening effect of PGr/PCu. The results and the model presented are of great significance to the development and application of laminated heterogeneous composites with multiple feature sizes.

特征尺寸（金属层的厚度h和面内晶粒尺寸d）以及它们的耦合协同影响纳米层压石墨烯/金属复合材料的机械性能。然而，以前的工作，包括数值计算和理论模型，主要集中在一个特征尺寸的影响上。在这项工作中，我们使用分子动力学模拟研究了特征尺寸及其耦合对纳米层压多晶石墨烯/多晶铜 (PGr/PCu) 复合材料在单轴压缩下的力学性能的影响。发现h对 PGr/PCu 的弹性和塑性阶段都有显着影响，但塑性阶段对d的依赖性与h相关，受不同的变形机制控制。因此，在纳米层压 PGr/PCu 复合材料中观察到五种位错传播模式。最后，将Hall-Petch和逆Hall-Petch定律和约束层滑移模型扩展到定量描述PGr/PCu的强化效果。所提出的结果和模型对于具有多种特征尺寸的层状异质复合材料的开发和应用具有重要意义。