Shock response of Cu/graphene nanolayered composites

摘要

Shock response of Cu/graphene nanolayered composites is investigated with molecular dynamics simulations, including deformation and spall damage of Cu, and delamination of the nanolaminates, as well as wrinkling, fracture and perforation of graphene, for parallel and normal shock loading. The Cu (111)/graphene interface is the source of dislocations in Cu and barrier to their propagation, and nucleation sites follow the Moire pattern. Direct transmission of dislocation across graphene is not observed. Spallation occurs at the Cu/graphene interface with a reduced tensile strength. Under strong shock loading, graphene forms wrinkles and folds upon compression, and fractures upon release and tension for parallel shocks, while it is perforated by Cu atoms for normal shock loading via defect formation in graphene at high temperatures. (C) 2016 Elsevier Ltd. All rights reserved.