【摘要】 石墨烯具有优异的机械性能,已成为众多复合材料中的理想增强体材料.本研究采用片状粉末冶金方法制备了具有仿生叠层结构的石墨烯/铝基复合材料,同时对纯铝基体与石墨烯/铝基复合材料进行了拉伸试验.通过基于Python语言自主研发的复合材料结构建模程序,可以有效建立石墨烯/铝基复合材料的三维复合结构模型,并实现石墨烯尺寸、形貌、取向、位置与含量等可控重构分布.通过引入组分材料力学性能、损伤行为、界面行为及边界条件等实现了石墨烯/铝基复合材料的拉伸行为模拟,并揭示了石墨烯形貌、石墨烯/铝界面、复合构型与失效行为等复合因素的影响规律,对理解石墨烯/铝基复合材料的变形机理提供了有力依据.更多还原

【Abstract】 Owing to its distinguished mechanical stiffness and strength, graphene has become an ideal reinforcing material in kinds of composite materials. In this work, the graphene(reduced graphene oxide) reinforced aluminum(Al)matrix composites were fabricated by flaky powder metallurgy. Tensile tests of pure Al matrix and graphene/Al composites with bioinspired layered structures are conducted.By means of an independently developed Python-based structural modeling program, three-dimensional microscopic structural models of graphene/Al composites can be established, in which the size, shape, orientation, location and content of graphene can be reconstructed in line with the actual graphene/Al composite structures. Elastoplastic mechanical properties, damaged materials behaviors, grapheneAl interfacial behaviors and reasonable boundary conditions are introduced and applied to perform the simulations. Based on the experimental and numerical tensile behaviors of graphene/Al composites, the effects of graphene morphology,graphene-Al interface, composite configuration and failure behavior within the tensile mechanical deformations of graphene/Al composites can be revealed and indicated, respectively.From the analysis above, a good understanding can be brought to light for the deformation mechanism of graphene/Al composites.更多还原