摘要
Graphene-like(GL) materials have enriched the application prospects of two-dimensional materials by virtue of their various structures and properties. However, the following theoretical issues remain unsolved: how can stable GL materials exist and is plate idealization valid for any GL materials? Here we answer these questions based on an atomistic potential-based approach.The existence criteria for GL materials with three common structures, including planar honeycomb(PH), buckled honeycomb(BH), and honeycomb MX_2(2 H-MX_2) structures, were established. Moreover, the validity of classic linear-elastic plate models for these materials was examined. A validity factor, which represents the validity of using thin plate models to investigate the overall mechanical response of GL sheets, was defined. We determined that 2 H-MX_2 sheets can approximately be modeled as thin plates for arbitrary loadings, unlike PH and BH sheets.
Graphene-like(GL) materials have enriched the application prospects of two-dimensional materials by virtue of their various structures and properties. However, the following theoretical issues remain unsolved: how can stable GL materials exist and is plate idealization valid for any GL materials? Here we answer these questions based on an atomistic potential-based approach.The existence criteria for GL materials with three common structures, including planar honeycomb(PH), buckled honeycomb(BH), and honeycomb MX_2(2 H-MX_2) structures, were established. Moreover, the validity of classic linear-elastic plate models for these materials was examined. A validity factor, which represents the validity of using thin plate models to investigate the overall mechanical response of GL sheets, was defined. We determined that 2 H-MX_2 sheets can approximately be modeled as thin plates for arbitrary loadings, unlike PH and BH sheets.
基金
supported by the National Natural Science Foundation of China(Grant Nos.11832019,11472313,and 11572355)
