Implementation of VIB (Virtual Internal bond) Model in Nanomaterial by using Finite Element Approach

Abstract

The Nano meters size of the materials are large fraction of surface atoms, high surface energy, spatial confinement, reduced imperfections, which do not exist in the corresponding bulk materials. Due to their small dimensions, nanomaterials have extremely large surface area to volume ratio, which makes surface or interfacial atoms to be large, resulting in more “surface” dependent material properties. This type of material finds it’s applications in carbon nanotube, nanocomposite, nanofibers and nanoparticles etc. The Virtual Internal Bond (VIB) model was implemented to understand micro level fracture behavior in nanomaterial. Using VIB model with VUMAT, dynamic explicit non-linear analysis was carried for different combinations of uniaxial, biaxial, triaxial and three points bending on plate with notch, plate with cut hole. The VIB model was applied in nanomaterial strip to investigate fracture behavior and effect of notch sensitivity on fracture strength for different nanostrip model. Analysis was carried out to understand the effect of same loading and boundary conditions on fracture strength of six different nanocomposite material models made up of combinations of fiber and matrix.