Abstract: Molecular dynamics simulations are performed for a block copper with an orbicular hole in the center under minus static pressures. The distortions, characteristics of atoms and radial distribution functions are calculated. Under a small minus pressure, an elastic stretch distortion appears and as the pressure exceeds a certain value plastic deformation and local phase transformation are found. Under extreme minus pressure, the material fractures. As the minus pressure increases the material experiences complex procedures： from an uniform elastic stretch to a local fcc~hcp struture transformation, then from a defect generation to a defect accumutation and finally a fracture forms.

Key words: molecular dynamics simulation, hole, damnification, local phase transformation