  In this work, we present a theoretical investigation of the elasticity
properties of new exotic carbon allotropes studied recently called
Irida-graphene and Sun-graphene. The Irida-graphene is a new 2D all-sp2 carbon
allotrope composed of fused rings containing 3-6-8 carbon atoms. However, The
Sun-graphene is a new carbon allotrope analogous to graphene, has a semi-metal
nanostructure and presents two Dirac cones in its band structure. Despite being
theoretically studied in single-layer (2D), no study of the elastic properties
of Irida-graphene-based nanotubes (Irida-CNTs) and Sun-graphene-based nanotubes
(Sun-CNTs) has not been studied yet. Thus, we seek to investigate the elastic
properties of nanotubes of these new exotic allotropes of carbon in
quasi-one-dimensional geometry (1D), nanotubes for different chiralities,
diameters and lengths at room temperature. For the development of the
theoretical investigation of the elasticity of the Irida-CNTs and Sun-CNTs, we
developed a fully reactive (ReaxFF) atomistic classical molecular dynamics
simulation method. Our theoretical results obtained in the computational
simulations show that the Irida-CNTs nanotubes behave as flexible nanostructure
and have a slightly higher value of strain rate than Sun-CNTs. The values of
Young's modulus for Irida-CNTs are slightly larger range (640.34 GPa - 825.00
GPa), while the Young's Modulus range of Sun-CNTs is 200.44 GPa - 472.84 GPa,
the lower values than those presented for conventional carbon nanotubes (CNT).
These findings provide insights into the mechanical behavior of Irida-CNTs and
Sun-CNTs and their potential applications in nanoscale devices.
