Bending characteristics of carbon nanotubes: Micropolar elasticity models and molecular dynamics simulations

R Izadi and M Tuna and P Trovalusci and N Fantuzzi, MECHANICS OF ADVANCED MATERIALS AND STRUCTURES (2021).

DOI: 10.1080/15376494.2021.2011499

The present paper aims at evaluating non-classical continuum parameters for each class of armchair and zigzag single-walled CNTs focusing on the scale effect in their flexural behavior observed in molecular dynamics (MD) simulations. Through a non-linear optimization approach, the bending rigidities obtained from atomistic simulations are compared to those derived from non-classical continua. For MD simulations, a novel method ensuring pure bending is introduced and for continuum modeling, micropolar, constrained micropolar, and modified couple stress theories are employed. The results reveal that adopted non-classical theories, notably micropolar theory, provide reasonable outcomes with an obvious failure of classical Cauchy theory.

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