▎ 摘　　要

This paper investigates the effect of hydroxyl groups on elastic properties of graphene oxide (GO) and its composites. A strain-dependent pseudo crease model considering the effects of out-of-plane initial strain and geometric configuration is proposed to predict the elastic modulus of GO, combining with a homogenization method. The results show that the elastic modulus of GO varies from 0.214 TPa to 0.463 TPa as tensile strain increases from 0 to 0.07. Further, considering GO as a rectangular inclusion and using the Mori-Tanaka method, the elastic properties of GO composites are predicted by taking aspect ratio and mass fraction of GO into account. Our study provides an effective method to evaluate the effects of functional groups on elastic modulus of GO and to understand the effect of microstructural parameters of GO on elastic properties of GO composites.