Microscale Numerical Simulation on Dynamic Damage for the Deflagrated Pressure Vessels

The defects on the surface of the deflagrated pressure vessels leading to damage are usually in the form of pits, scratches or machine marks. A microscale numerical simulation method is presented for the dynamic damage process under the instantaneous impacted shock. The surface defects are described as the rectangle gap, the round gap and the groove. For fcc and other close-packed metals material, the embedded atom method (EAM), which has proven particularly good at modeling bulk and defect properties of metals and metal alloys, is used to describe the interactions among the metal atoms. The Molecular Dynamics (MD) code named LAMMPS is used to calculate the velocity of atoms and the pressure distribution in dynamic damage process. The results show the different damage effects of the metal material with different surface defects under the instantaneous impacted shock by the deflagration.