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Failure processes in embedded monolayer graphene under axial compression
Charalampos Androulidakis1, Emmanuel N Koukaras2, Otakar Frank3
11] Department of Materials Science, University of Patras, Rio Patras, 26504 (Greece) [2] Institute of Chemical Engineering Sciences, Foundation of Research and Technology-Hellas (FORTH/ICE-HT), Stadiou Street, Platani, Patras Acahaias, 26504 (Greece).
Scientific Reports
|June 13, 2014
Summary
Graphene flakes embedded in polymer fail at -0.60% strain, independent of size. Polymer constraint causes buckling at a fixed strain, unlike in air, with wrinkle wavelengths of 1-2 nm.
Area of Science:
- Materials Science
- Nanotechnology
- Solid Mechanics
Background:
- Graphene's mechanical properties are crucial for its applications.
- Understanding graphene's failure mechanisms under load is essential.
- Polymer matrix effects on graphene mechanics are not fully understood.
Purpose of the Study:
- To determine the critical strain for failure in graphene flakes within a polymer matrix.
- To investigate the influence of flake size on graphene's mechanical response.
- To analyze the buckling behavior of graphene under constrained conditions.
Main Methods:
- Embedding monolayer graphene flakes in a polymer matrix.
- Applying axial compression and monitoring Raman phonon shifts.
- Utilizing Euler mechanics and Winkler approach for theoretical analysis.
- Performing Density Functional Theory (DFT) computations.
Main Results:
- Critical strain for first failure is -0.60%, independent of flake size.
- Yield stress reaches up to -6 GPa.
- Polymer constraint leads to fixed-strain buckling with 1-2 nm wrinkle wavelengths.
- Good agreement between experimental results and DFT computations.
Conclusions:
- Graphene's failure strain in a polymer matrix is size-independent.
- Polymer confinement alters graphene's buckling mechanism.
- The study provides insights into the mechanical behavior of graphene composites.
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