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Molecular dynamics and micromechanics study of hygroelastic behavior in graphene oxide-epoxy nanocomposites
- Issue Date
- May-2019
- Publisher
- Elsevier Ltd
- Keywords
- Nanocomposites; Graphene oxide; Hygroelastic; Molecular dynamics simulation; Multi-inclusion model
- Citation
- Composites Part B: Engineering, v.164, pp 425 - 436
- Pages
- 12
- Journal Title
- Composites Part B: Engineering
- Volume
- 164
- Start Page
- 425
- End Page
- 436
- ISSN
- 1359-8368
1879-1069
- Abstract
- The hygroelasticity of oxygen-functionalized graphene (GO)-epoxy nanocomposites is studied. Two different transversely isotropic nanocomposite molecular models are constructed: with uniformly distributed and interface-concentrated water molecules, respectively. The stress-strain curves and coefficients of moisture expansion (CMEs) are determined according to moisture content. The degradation of the GO/epoxy interface due to the infiltrated moisture is characterized by interfacial decohesion tests. The micromechanics model is used to derive new closed-form solutions for the effective elastic stiffness and CME of multi-phase composites with interfacial imperfections. Regardless of the moisture distribution, the overall hygroelastic behavior of nanocomposites clearly degrades upon moisture absorption. © 2019
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