The 6th International Conference on Matter and Radiation at Extremes (ICMRE2023)

125 / 2023-04-14 13:49:00

Discrete element simulation of shock induced phase transition

Discrete element method; phase transition; Shock wave

High Pressure Physics and Materials Science > Transitions-poster

A discrete element method (DEM) code combined with undiffused two-phase transition model, thermodynamic consistent Helmholtz free energy function, and phase transition kinetics of relaxation equation is applied to simulate the α-iron and polycrystalline iron phase transition process. Through the numerical simulation phase boundary, Hugoniot relation and free surface velocity profiles are obtained. The wave interaction in the loading and unloading process under different pressure is analyzed. The characteristics of loading and unloading wave velocity are acquired. The shock-front irregularities of various grain size and travel distance as the shock wave penetrates in the polycrystal is studied. The character of polycrystalline iron phase transition is revealed.