  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. In particular, it was
established that the energy dissipation during CNT sliding leads to extended
load transfer that conditions material-like mechanical response of the weakly
bonded assemblies of CNTs.
