Study of Shock-induced Polycrystalline Iron Phase Transition with DEM

doi:10.3969/j.issn.1000-1093.2014.07.011

Abstract

Abstract: Numerical simulations on α-iron and polycrystalline iron are conducted using discrete element method (DEM) combined with undiffused two-phase transition model, thermodynamic consistent free energy function, and phase transition kinetics of relaxation equation. The phase boundary and Hugoniot relation are obtained through numerical simulation. The simulation result of polycrystalline iron shows that the shock-front irregularities rise when the propagation distance of shock wave increases; and the shock-front is more irregular in the coarse grain model than in the fine grain model; the phase transitions in the polycrystalline are heterogeneous, and the transitions are observed first along grain boundaries. The curve of local average pressure and transformed mass fraction is obtained.

Key words: explosion mechanics, shock-induced phase transition, discrete element method, polycrystal

CLC Number:

O313.4

LIU Chao, SHI Yi-na, QIN Cheng-sen, LIANG Xian-hong. Study of Shock-induced Polycrystalline Iron Phase Transition with DEM[J]. Acta Armamentarii, 2014, 35(7): 1009-1015.

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