α铁冲击相变的离散元方法

Shock Induced α-Iron Phase Transition in DEM

利用离散元方法结合基于无扩散相变的两相模型、热力学相容的自由能函数与有限速率相变动力学方程,模拟α铁的冲击相变过程.得到铁的相边界、冲击Hugoniot关系及自由面速度剖面,并对不同冲击压力下加卸载过程的波系传播和相互作用过程进行分析,获得了加卸载波速特征.

Discrete element method combined with undiffused two-phase transition model, thermodynamic consistent Helmholtz free energy function, and phase transition kinetics of relaxation equation are used to simulate α-iron phase transition process. Through simulation of phase boundary, Hugoniot relation and free surface velocity profiles are obtained. Wave interaction in loading and unloading process under different pressures is analyzed. Characteristics of loading and unloading wave vetocitv are acquired.