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A steinberg-guinan model for high-pressure carbon: Diamond phase

Abstract:

Since the diamond phase of carbon has such a high yield strength, dynamic simulations must account for strength even for strong shock waves (∼ 3 Mbar). We have determined an initial parametrization of two strength models: Steinberg-Guinan (SG) and a modified or improved SG(ISG), that captures the high pressure dependence of the calculated shear modulus up to 10 Mbar. The models are based upon available experimental data and on calculated elastic moduli using robust density functional theory. Additionally, we have evaluated these models using hydrodynamic simulations of planar shocks experiments. © 2007 American Institute of Physics.