Theoretical study of void collapse and hot spot formation mechanism for energetic material

Based on molecular dynamics simulation, we find that hot spot in explosive is induced by inelastic impaction between void faces and develop a physical model to describe the temperature rising mechanism. A set of thermodynamic parameters for void collapse and hot spot is calculated. The hot spot relaxation time is proportional to square of hot spot size, and the plastic work is proportional to hot spot volume. A complete physical picture for hot spot formation is obtained.