Negative Poisson's ratio (NPR),also known as "auxetic",is a highly desired property in a wide range of future industry applications.By employing molecular dynamics (MD) simulation,metal matrix nanocomposites reinforced by graphene sheets are studied in this paper.In the simulation,single crystal copper with crystal orientation[1 1 0]is selected as the matrix and an embeddedatom method (EAM) potential is used to describe the interaction of copper atoms.An aligned graphene sheet is selected as reinforcement,and a hybrid potential,namely,the Erhart-Albe potential,is used for the interaction between a pair of carbon atoms.The interaction between the carbon atom and copper atom is approximated by the Lennard-Jones (L-J) potential.The simulation results showed that both graphene and copper matrix possess in-plane NPRs.The temperature-dependent mechanical properties of graphene/copper nanocomposites with in-plane NPRs are obtained for the first time.
展开▼
