The jump phenomenon of dynamic Poisson's ratio and dynamic Young's modulus in compressed copper nanorods

摘要

In the paper, copper nanorods with different orientations and different lengths are simulated with applying the uniaxial compression load by the molecular dynamics method. Dynamic Poisson's ratio and dynamic Young's modulus of the nanorods at the process of the simulations are discussed. Aiming to a rigorous research, the tensile nanorods and the compressed nanorods are compared first. When a nanorod is compressed, there is a jump phenomenon in the changing process of dynamic Poisson's ratio and dynamic Young's modulus. The sequential order of jumps appearing is associated with the crystal orientation and the length of the nanorods. The smaller the orientation size is, the earlier the jump occurs. The compressed nanorod is stable when the size ratio of a nanorod is suitable and, simultaneously, the jump ranges of both Poisson's ratio and Young's modulus are the lowest.