Interpreting the shock response of porous oxide systems

18th APS-SCCM; 24th AIRAPT

Fredenburg, D.A.^1 ; Koller, D.D.^1

Los Alamos National Laboratory, Los Alamos

NM

87545, United States^1

关键词: Constant pressures;    Energy-based models;    High-pressure phase;    Shock compressions;    Solid material;    Strength parameters;    Thermodynamic values;    Variable parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/11/112025/pdf
DOI  :  10.1088/1742-6596/500/11/112025

来源: IOP

【 摘 要 】

An energy based model is developed to described the shock compression response of phase transitioning porous materials. Assuming the solid and porous materials transform to the same high pressure phase (HPP), the shock response of the solid material is used to define the energy limits E1, the energy at which the shocked solid begins to deviate from the Hugoniot of the low pressure phase, and E2, the energy at which the shocked solid begins to asymptote to the equilibrium HPP. With the Hugoniot of the HPP solid known, the porous Hugoniot is calculated using an isobaric (constant pressure) approach, with at present two variable parameters. The parameters are the thermodynamic value of the initial Gruneisen constant, γ0, and the yield/transition strength parameter, σy. The approach is demonstrated for several different initial distentions of SiO2.