Investigation of Wave Propagation in Multiwall Carbon Nanotubes

摘要

Carbon nanotubes (CNTs) possess extraordinary physical properties. The fundamental understanding of nano-structure material properties and their effect on the mechanical behavior are required in order to develop reliable constitutive models for various design purposes. Since controlled experiments at nanoscales is difficult, and molecular-dynamics simulations remain formidable expense especially for large-scale systems, continuum elastic models have been widely and successfully used to study buckling, vibration and wave propagation in CNTs. MWCNTs (Multiwall Carbon Nanotubes) have been modeled as a single elastic beam which ignored non-coaxial intertube radial displacements and the related internal degrees of freedom. Ru] et al suggested a multiple-elastic-beam mode. This model is only applicable for CNTs with the certain range radius when R{sub}(NT)/a{sub}(NT)≈1(a{sub}(NT) is the width of hexagonal carbon rings, of about 0.24nm).The diameter of NTs, d{sub}(NT), may vary from about 0.4 to 100nm.