In this work we present a computational study of the small strain mechanics of freestanding ultrathin CNT films under in-plane loading. The numerical modeling of the mechanics of representatively large specimens with realistic micro- and nanostructure is presented. Our simulations utilize the scalable implementation of the mesoscopic distinct element method of the waLBerla multi-physics framework. Within our modeling approach, CNTs are represented as chains of interacting rigid segments. Neighboring segments in the chain are connected with elastic bonds, resolving tension, bending, shear and torsional deformations. These bonds represent a covalent bonding within CNT surface and utilize Enhanced Vector Model (EVM) formalism. Segments of the neighboring CNTs interact with realistic coarse-grained anisotropic vdW potential, enabling relative slip of CNTs in contact. The advanced simulation technique allowed us to gain useful insights on the behavior of CNT materials. It was established that the energy dissipation during CNT sliding leads to extended load transfer that conditions size independent, material-like mechanical response of the weakly bonded assemblies of CNTs.
Size-Independent Mechanical Response of Ultrathin CNT Films in Mesoscopic Distinct Element Method Simulations
Contributed by the Applied Mechanics Division of ASME for publication in the Journal of Applied Mechanics. Manuscript received July 2, 2019; final manuscript received August 1, 2019; published online xx xx, xxxx. Assoc. Editor: Jizhou Song.
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Ostanin, I., Dumitrica, T., Eibl, S., and Ruede, U. (August 2, 2019). "Size-Independent Mechanical Response of Ultrathin CNT Films in Mesoscopic Distinct Element Method Simulations." ASME. J. Appl. Mech. doi: https://doi.org/10.1115/1.4044413
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