6. Microscale Structural Study of GBM-Reinforced Nanocomposites
7.2. Limitations and Future Work
The research presented in this thesis about GBM-reinforced nanocomposites is a contribution to the scientific knowledge with the outcomes summarised in the previous section. Microstructural features of GBM-nanocomposites were characterised and their effect on Young’s modulus of the nanocomposites were researched in this PhD work. These microstructural features include morphological states, orientation distributions, and spatial distributions of the GBMs. Wrinkling of the GBMs after dispersion in nanocomposites were not taken into account in this study.
The type of nanocomposites studied in this project was limited to those with GO fillers and SA matrix. Those with graphite nanoplates (GNPs), PVA and epoxy matrix were also studied. But they were addressed only in optical characterisation stage of the project. Therefore, the MICOTCOM method presented in this thesis can be extended to nanocomposites with other types of GBMs and different translucent matrices. The MICOTCOM method developed in this thesis can only be applied for composites that can transmit visible light.
Finite-element models created in this work were simulated only in the elastic range of the materials’ mechanical behaviour. In future studies, plastic deformation behaviours of the nanocomposites will be studied through the similar approaches described in the thesis. Deformations in microstructure of the nanocomposites will be monitored through an optical microscope on stage of which a stretcher device is
mounted. This rig will allow real-time assessment of accuracy of finite-element models in simulating elastoplastic deformation behaviour of the nanocomposites.
Figure 7-1 FE models with different orientation and volume fraction of reinforcements
Also, a study to find the link between average orientation and effective properties of GBM-nanocomposites will be carried out. A parametric finite-element modelling approach will be followed in this study. The parameters will include volume fraction and average orientation of fillers, properties of constituent materials and dimensions of the models. Some FE models from a preliminary work are shown in Figure 7-1.
Results of such study are expected to produce a constant that can be implemented into micromechanical models to account for orientation of nanoflakes, so that more precise prediction of effective properties can be done.
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