Multiscale study of influence of interfacial decohesion on piezoresistivity of graphene/polymer nanocomposites

被引：5
作者：
Lu, Xiaoxin [1 ,2 ]
Detrez, Fabrice [2 ]
Yvonnet, Julien [2 ]
Bai, Jinbo [1 ]
机构：
[1] Univ Paris Saclay, Lab Mecan Sols Struct & Mat, CNRS, UMR 8579, 8-10 Rue Joliot Curie, F-91190 Gif Sur Yvette, France
[2] Univ Paris Est, Lab Modelisat & Simulat Multi Echelle, CNRS, UMR 8208, 5 Blvd Descartes, F-77454 Marne La Vallee 2, France
来源：
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING | 2019年 / 27卷 / 03期
关键词：
polymer graphene nanocomposites; imperfect interface; cohesive zone model; electromechanical coupling; MOLECULAR-DYNAMICS; CARBON NANOTUBE; MECHANICAL-PROPERTIES; FINITE-ELEMENT; REINFORCED NANOCOMPOSITES; ELECTRICAL-CONDUCTIVITY; DIELECTRIC PERMITTIVITY; POLYMER NANOCOMPOSITES; BRITTLE-FRACTURE; CRACK-GROWTH;
D O I：
10.1088/1361-651X/aafa58
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A multiscale strategy is proposed to study the role of interfacial decohesion on the piezoresistive properties of a graphene/polymer nanocomposite. The piezoresistive effect is a change in the electrical resistivity when mechanical strain is applied. First, a cohesive zone model is identified by atomistic simulations. This cohesive zone model enriches imperfect interfaces, which model graphene sheet, at mesoscale in our continuum mechanical model. This nonlinear mechanical model is used to generate deformed representative volume element to study the influence of strain and interfacial decohesion on the conductivity of graphene/polymer nanocomposites. The effective conductivity is studied with an electric continuum model at mesoscale that incorporates the tunneling effect. A conductor-insulator transition is observed for elongations above 2% for graphene volume fraction just above the percolation threshold. The transition appears for an elongation of 8% instead of 2%, when the interfacial decohesion is neglected.
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页数：21
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