Abstract
Mechanics modeling of carbon nanotube (CNT) yarns are reviewed in this chapter. Analytical models based on general descriptions of twisted yarn structures can only predict qualitatively the stress distribution inside the yarn and the trends of twist-dependent yarn performances. CNT yarns have a hierarchical structure comprising many CNT bundles. The intertube sliding that determines the precise mechanics of a dry CNT bundle can be simulated using molecular dynamics. A full atomistic treatment can be used to predict the tensile behaviors of polymer-modified or covalently-bonded CNT bundles. As the size of the CNT assembly increases, it becomes necessary to use coarse-grained molecular dynamics to study the microstructural evolution of different CNT structures. Due to the hierarchical structure of CNT yarns, multiscale modeling is becoming an increasingly important tool for the study of CNT yarn mechanics.
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