Study On The Mechanical Properties Of Scratching Of Graphene/Cu Nanocomposites

Graphene is a low-dimensional carbon structure with excellent physical properties and is considered to be a new material in the 21 st century.In recent years,graphene has rapidly attracted widespread attention due to its unique structure,and has become a research hotspot in the fields of materials science and condensed matter physics.Graphene/metal composites are one of the key research directions for graphene applications.Graphene/metal composites are still in the preliminary exploration stage in performance research,and there are many challenges in material application.With the gradual maturity of molecular dynamics methods,the study of the basic mechanical properties of graphene/copper nanocomposites is deeper.In this paper,the molecular dynamics method is used to study the important role of graphene in materials by analyzing the failure mechanism and dislocation changes of materials.In this paper,molecular dynamics models of scratches in single crystal copper and graphene/copper nanocomposites were established.The numerical simulation method was used to study the mechanical properties of single crystal copper and graphene/copper composites under the action of scratches and the formation mechanism of dislocations.The effects of graphene position,number of graphene layers,scratch depth and scratch speed on the mechanical properties of graphene/copper composites were investigated.It is concluded that the addition of graphene improves the frictional resistance of the composite compared with single crystal copper;the more the graphene layer,the better the mechanical properties of the composite;the deeper the indenter is pressed into the copper matrix,The larger the dislocation distribution range,the deeper the distribution depth;the greater the vertical distance of graphene from the coppersubstrate surface,the stronger the reinforcing effect on the scratch performance of the composite material.In the scratch stage,the indenter is in a certain speed range,and the higher the speed,the higher the dislocation height of the indenter leading edge of the graphene/copper composite material,the larger the dislocation range and the greater the frictional resistance.