A theoretical evaluation of load transfer in multi-walled carbon nanotubes

Load transfer in the multi-walled carbon nanotubes (MWCNTs) is studied using a shear-lag model that accounts for the atomistic features. The analysis takes into account both the lattice registry effect and the elasticity of the CNTs. It is shown that the strength utilization ratio cannot be further improved either by increasing the CNT length beyond five times of a characteristic length, or by a change in the layer spacing, and the diameter and the chirality of the CNTs. Therefore, MWCNTs are not a good reinforcement in composites from the aspect of interwall load transfer.

Load transfer in the MWCNTs is studied using a shear-lag model that accounts for both the lattice registry effect and the elasticity of the CNTs. The upper limit of the strength utilization ratio shows MWCNTs are not a good reinforcement in composites from the aspect of interwall load transfer.Figure optionsDownload as PowerPoint slideResearch highlights
► Extended shear-lag theory is developed for the load transfer in the MWCNTs.
► Both lattice registry effect and elasticity of the CNTs are taken into account.
► Strength of the inner walls is not fully utilized in the CNT-reinforced composites.
► MWCNTs are not good reinforcements from the aspect of interwall load transfer.