Prediction of the mechanical properties of graphene/epoxy resin nanocomposites based on flexible node beam element and layered method

doi:10.19936/j.cnki.2096-8000.20220428.003

Abstract

Abstract: The mechanical properties of graphene/epoxy resin nanocomposites were analyzed and predicted by establishing the finite element model of sandwich representative volume element. In the finite element modeling, the flexible node beam element was used to simulate the graphene structure, the layered method was used to deal with the interfacial layer with gradient material properties, and the 8-node hexahedral solid element was used to discretize the epoxy resin matrix. According to the Young′s modulus of graphene, the flexibility coefficient of flexible node beam element was determined by comparing with the experimental value and simulation value given in the literature, and then the Young′s modulus E_cx of graphene/epoxy resin nanocomposites was predicted without considering the interfacial layer. The prediction results are in good agreement with the calculation results of the role of mixture (ROM) formula, which verifies the correctness and reliability of the proposed method. The convergence of the layered method was discussed by numerical examples of Young′s modulus E_cx and shear modulus G_xy. The results show that when the interfacial layer is divided into 8 layers, a good convergence result has been obtained. When considering the interfacial layer, the predicted Young′s modulus E_cx is larger than that of ROM, and the calculated value is closer to the experimental value than that of ROM in the case of exponential function distribution of material properties of interfacial layer, which verifies the necessity of considering interfacial layer.

Key words: graphene nanocomposites, flexible node beam element, layered method, finite element analysis, mechanical property

CLC Number:

TB332

PENG Chang-wei, HUANG Jun, WU Yu, YE Tai-zhi, HUANG Li-xin. Prediction of the mechanical properties of graphene/epoxy resin nanocomposites based on flexible node beam element and layered method[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(4): 18-26.

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