Fatigue in assemblies of indefatigable carbon nanotubes
| Autor: | Nitant Gupta, Evgeni S. Penev, Boris I. Yakobson |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| DOI: | 10.1126/sciadv.abj6996 |
| Popis: | Description Fatigue in nanotube assemblies happens much more readily at tube-tube interfaces rather than inside their walls. Despite being one of the most consequential processes in the utilization of structural materials, fatigue at the nano- and mesoscale has been marginally explored or understood even for the most promising nanocarbon forms—nanotubes and graphene. By combining atomistic models with kinetic Monte Carlo simulations, we show that a pristine carbon nanotube under ambient working conditions is essentially indefatigable—accumulating no structural memory of prior load; over time, it probabilistically breaks, abruptly. In contrast, by using coarse-grained modeling, we demonstrate that any practical assemblies of nanotubes, e.g., bundles and fibers, display a clear gradual strength degradation in cyclic tensile loading due to recurrence and ratchet-up of slip at the tube-tube interfaces, not occurring under static load even of equal amplitude. |
| Databáze: | OpenAIRE |
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