▎ 摘　　要

The central and noncentral harmonic force constants of the Keating model, proposed previously for describing elastic graphene constant, are obtained for 13 graphene-like IV-IV and III-V compounds. It is shown that the relative role of the noncentral forces decreases with an increase in the compound ionicity. For graphene, the anharmonic central-interaction constant is estimated and the dependences of the second-order elastic constants on the two-dimensional pressure are calculated. Values of the photoelastic constants are determined.