MOLECULAR DYNAMIC MODELING OF PLASTICITY OF Al AND Al-Cu ALLOYS UNDER DYNAMIC LOADING

VV Stegailov and AY Kuksin and GE Norman and AV Yanilkin, SHOCK COMPRESSION OF CONDENSED MATTER - 2009, PTS 1 AND 2, 1195, 781-784 (2009).

The molecular dynamic (MD) simulations presented are devoted to the study of mechanisms and kinetics of shock-induced plasticity of Al and its alloy with Cu. Dislocation velocities as functions of applied shear stress are calculated in a wide temperature range up to melting point. Dislocation interaction with nanosize obstacles is considered. The critical resolved shear stress necessary for a dislocation to penetrate through an obstacle is determined. The results are used to characterize the effect of temperature on the dynamic yield stress in perfect crystals and crystals with nano-sized obstacles.

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