Abstract
In the in situ tensile tests of polymer-GNP nanocomposites, the damage initiation in the interfacial zone is directly related to the surface adhesion in the interface. Adding functional groups to GNP increases the adhesion between polymer and inclusion and significantly reduces damage in the interfacial zone. This research was developed based on hierarchical multiscale modeling to investigate damage initiation in polymer-GNP nanocomposites. In the first step, the effect of functional groups on the surface adhesion between GNP and HDPE at the nanoscale was investigated by MD simulations, and the Pull-out test and force–displacement curve were obtained. A cohesive finite element approach was exploited in the second step to model debonding. The results show that the functional groups (H, OH, and COOH) will cause delayed damage in the interfacial zone, and debonding will begin at higher strains. Also, the damage initiation is directly linked to the type of functional groups. The effect of functional groups in different volume fractions of nanoparticles shows that the damage initiates earlier with an increase in the volume fraction of GNPs in constant percentage coverage of each type of the functional group. However, the effect of the functional groups in reducing effective strain in the damage initiation is more significant than the volume fraction of GNPs. After applying a 20% strain at various volume fractions, the COOH functional groups significantly reduced fully debonded surfaces. Furthermore, we investigated the impact of volume fraction on fully debonded surfaces in both pure and COOH functional groups. A nonlinear trend is apparent as the volume fraction increases from 0.3 to 1.5%. The effects of multiple bonding types are taken into account by creating several RVEs with a constant volume fraction of 1.5 and a different proportion of functional groups.
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Safaei, M., Pourbandari, D., Karimi, M.R. et al. Developing a multiscale approach for damage analysis of functionalized-GNP/PET nanocomposite. J Mater Sci 59, 2907–2923 (2024). https://doi.org/10.1007/s10853-024-09364-3
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DOI: https://doi.org/10.1007/s10853-024-09364-3