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Abstract
In the present study, the characteristics of graphene/polycrystalline copper nanolaminated (GPCuNL) composites under shear loading are investigated by molecular dynamics simulations. The effects of different temperatures, graphene chirality, repeat layer spacing, and grain size on the mechanical properties, such as failure mechanism, dislocation, and shear modulus, are observed. The results indicate that as the temperature increases, the content of Shockley dislocations will increase and the maximum shear stress of the zigzag and armchair directions also decreases. The mechanical strength of the zigzag direction is more dependent on the temperature than that of the armchair direction. Moreover, self-healing occurs in the armchair direction, which causes the shear stress to increase after failure. Furthermore, the maximum shear stress and the shear strength of the composites decrease with an increase of the repeat layer spacing. Also, the shear modulus increases by increasing the grain size of copper.
Highlights
The shear stress of the composites is reduced to a constant value of about 0.5 GPa, which is close to the maximum shear stress of PCu
The following results are obtained: (1) For the zigzag direction of graphene, the maximum shear stress and strain will decrease with an increase of temperature
After the composite structure is destroyed, the shear stress is reduced to about 0.5 GPa, which is close to the shear stress value of polycrystalline Cu
Summary
Graphene is a monolayered hexagonal thin film composed of sp2-bonded carbon atoms and has extraordinary properties for applications in nanoelectronics [1-6]. Because of the two-dimensional structure, graphene is limited as a structural material [7,8]. Research on composite materials found that nanocomposites can provide better performance than a single material [9]. Three-dimensional graphene composites have been developed in recent years, which exhibit excellent properties in various fields, such as supercapacitors, integrated electrodes, catalysis, and sensors [10-13]. The interaction between graphene and matrix materials directly affects the mechanical properties of composites [14]. The van der Waals force between graphene and metals can increase the strength of composites [15,16]
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