摘要
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絵110is 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.
基金
This study was supported by the National Natural Science Foundation of China(Grant 51779138)
the Australian Research Council(Grant DP140104156).