▎ 摘　　要

In this article, a newly developed model is utilized to simulate the strain-rate-dependent constitutive equation of graphene/polypropylene nanocomposites, using the mechanical properties of the constituent materials of nanocomposites. The model is a combination of the micromechanics and Goldberg models called strain-rate-dependent micromechanics (SRDM) model. The Johnson-Cook material model is used by the explicit finite element code LS-DYNA to simulate the strain-rate-dependent mechanical behavior of the standard tensile test specimen made of graphene/polypropylene nanocomposites under dynamic loading and its constants are calculated by the SRDM model. Polypropylene reinforced with 0.5, 1.0, and 2.0 wt% graphene sheets were prepared via coating polypropylene with graphene particles. Then, by melt blending in a twin-screw extruder followed by an injection molding process, the nanocomposite samples are manufactured. Good enhancements of Young's modulus and yield stress at very low graphene contents are achieved. To evaluate the current model, the results are compared with the experimental result of the standard tensile test specimen. A good agreement between the experimental data and the SRDM model is achieved.