Mechanical Response of Nano-Porous Copper under Different Temperature and Strain Rate through Molecular Dynamics Simulations

摘要

As a type of nanostructured material with nanosized porosity and ultrahigh specific surface area, nanoporous metals attract much attention in both industrial and theoretical fields. Through molecular dynamics simulations, the strain energy of nanoporous copper is investigated with special consideration on the effect of temperature and strain rate. First, with the variation of temperature and strain rate, the change of both stress and strain energy is plotted. Dislocation movement and structural response of nanoporous copper are explored in different stages of strain. Secondly, yield points under different conditions are analyzed to demonstrate the super plasticity of nanoporous copper. It is interesting that critical points appears. Based on above mentioned investigation, it is expected to provide a simple description on mechanical property and performance of nanoporous metals.