Abstract
Formation of a void is a considerable feature for a number of engineering materials, because failure by coalescence of the voids is an important fracture mechanism in ductile solids. There are some theoretical solutions of the void formation for a nonlinear elastic solid. On the other hand, it is important to study microscopic void formation, in order to consider the initiation of the void. In this paper, we simulate some void formations by using Molecular Dynamics and FEM. The cylinder with an atom defect is constructed with nickel atoms and is subjected to the hydrostatic tensile load by using Molecular Dynamics. As the load exceeds, sudden appearance of the void is observed and it develops. The same simulation is proceeded by FEM for nonlinear elastic solid. In the simulation, the mechanical properties, which are given by the potential function of the Molecular Dynamics, are used. The behaviors of the void initiation by the two methods, which are microscopic and macroscopic method, are compared to each other.
