Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.024
Publication date: 11th July 2022
In the present study the analytical modelling of graphene/PMMA nanocomposite under hygro-thermo-mechanical loading is performed. The 2D analytical method consists of the use of the stress-function variational method, which was validated with experimental data in our previous paper [1]. Three cases of loading – heating, cooling and mixed (hygro-thermo-mechanical) are considered and compared with mechanical one. It was found, that all resultant stresses for heating in the layers show the same behavior like mechanical ones with slight increase in amplitude. At cooling the stresses look as a mirror image in respect to the heating case. Also, at heating, the axial stress in graphene increases with increasing the temperature, but the axial stress in the substrate PMMA decreases at the same time. At cooling the stresses show an opposite behavior. The parametric analysis for the influence of external mechanical, temperature and moisture loading, is performed. It was found, that mechanical loading influences significantly the mixed interface shear stress. There is a critical mechanical load of 350 MPa, after that the delamination takes place for mixed case. Without this loading, delamination is not possible nevertheless of applied thermal and/or moisture load. The interface delamination appears from the left and from the right length side of the structure simultaneously.
This study has been carried out with the financial support of DFG project No. BE 1090/48-1 “Some industrial applications for nanocomposites under mechanical and environmental loading”.
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