Equation of state for shock compression of distended solids

18th APS-SCCM; 24th AIRAPT

Grady, Dennis^1 ; Fenton, Gregg^1 ; Vogler, Tracy^2

Southwest Division, Applied Research Associates, 4300 San Mateo Blvd NE, Albuquerque

NM

87110, United States^1

Sandia National Laboratory, MS 9042, 7011 East Ave., Livermore

CA

94550, United States^2

关键词: Additive function;    Behavior characteristic;    Equation of state;    Experimental evidence;    Shock compressions;    Shock Hugoniot;    Tantalum pentoxide;    Thermal pressure;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/15/152007/pdf
DOI  :  10.1088/1742-6596/500/15/152007

来源: IOP

【 摘 要 】

Shock Hugoniot data for full-density and porous compounds of boron carbide, silicon dioxide, tantalum pentoxide, uranium dioxide and playa alluvium are investigated for the purpose of equation-of-state representation of intense shock compression. Complications of multivalued Hugoniot behavior characteristic of highly distended solids are addressed through the application of enthalpy-based equations of state of the form originally proposed by Rice and Walsh in the late 1950's. Additive measures of cold and thermal pressure intrinsic to the Mie-Gruneisen EOS framework is replaced by isobaric additive functions of the cold and thermal specific volume components in the enthalpy-based formulation. Additionally, experimental evidence reveals enhancement of shock-induced phase transformation on the Hugoniot with increasing levels of initial distension for silicon dioxide, uranium dioxide and possibly boron carbide. Methods for addressing this experimentally observed feature of the shock compression are incorporated into the EOS model.