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Owing to its superior mechanical properties, graphene has been used to reinforce and substantially improve the strength of composite materials. Still lacking, however, is a clear understanding of graphene's reinforcing mechanism at the atomic level, especially in relation to its pull-out behavior. By molecular dynamics (MD), it is found that pull-out of graphene, different from that of micro fibers,...
Carbon nanotubes (CNTs) are attractive candidates as nanofillers in reinforcing ordinary Portland cement (OPC) due to their superior mechanical properties. In this study, the engineering properties of CNT–OPC pastes were investigated with varied ultrasonication energy (UE) and CNT concentration. It was found that UE could effectively improve the aqueous dispersion of surface functionalized CNTs with...
Ultrasonication is extensively used in the fabrication of carbon nanotube (CNT) reinforced composites. However, there has been very limited research into predicting the effect of ultrasonication treatment on the reinforcing efficiency of CNTs. In this study, a theoretical framework with supporting experiments is developed to address this issue. The distribution of CNT lengths and the concentration...
The initiation and development of wrinkles in a single layer graphene sheet subjected to in-plane shear displacements are investigated. The dependence of the wavelength and amplitude of wrinkles on the applied shear displacements is explicitly obtained with molecular mechanics simulations. A continuum model is developed for the characteristics of the wrinkles which show that the wrinkle wavelength...
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