Accession Number : AD0288907

Title :   DYNAMIC PROPERTIES OF MATTER UNDER HIGH STRESSTHERMODYNAMIC DESCRIPTIONS

Corporate Author : RAND CORP SANTA MONICA CALIF

Personal Author(s) : BRODE,H.L. ; SMITH,A.C.

Report Date : NOV 1962

Pagination or Media Count : 1

Abstract : Although solids behave elastically at very low stress levels, and exhibit complex visco-elastic and plastic behavior at higher stress levels, when stresses in the megabar range are applied, it is generally more meaningful to ignore stress tensor descriptions and turn to thermodynamic and fluid dynamic descriptions. At high enough stress levels the response of any material must be viewed as characteristic of a compressible fluid. Some empirical information is available in the regions of stress of a few kilobars to a few megabars from high explosive shock experiments. Static compression data are useful guides at lower stresses, while at the highest levels one finds the properties are reasonably well determined by atomic models such as a FermiThomas-Dirac temperature-dependent model. Theoretical calculations, numerical in nature, have provided the thermodynamic properties of all atomic elements. The properties of chemical mixtures as occur in natural materials can be constructed from suitable combinations of these elementary results. Successful use has been made of such results for calculations of dynamic response under high impulse loadings in a variety of applications. One particular example (for basalt) is illustrated. (Author)

Descriptors :   *COMPRESSIBLE FLOW, *HIGH TEMPERATURE, *ROCK (GEOLOGY), *SOLIDS, *STRESSES, *THERMODYNAMICS, PRESSURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE