Accession Number : ADA320691

Title :   An Equation of State for Metals.

Descriptive Note : Final rept. 18 Jul-5 Aug 96,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Segletes, Steven B.

PDF Url : ADA320691

Report Date : NOV 1996

Pagination or Media Count : 68

Abstract : A new analytical equation of state is offered for metals. The form is expressible completely in terms of the maximum lattice vibration frequency, macroscopically expressible as the characteristic temperature, theta, and its derivatives. For one particularly useful special case, the results have been found to match both cold-curve and shock-Hugoniot data for a variety of metals. The equation is of the Gruneisen variety, in which the Gruneisen parameter is specified as a function of volume only. The equation begins to lose accuracy in the pressure range of one to several megabars, perhaps because of the breakdown of the Gruneisen assumption, whereupon the Gruneisen parameter becomes energy dependent.

Descriptors :   *METALS, *EQUATIONS OF STATE, *GRUNEISEN CONSTANT, FREQUENCY, TEMPERATURE, VIBRATION, PARAMETERS, ACCURACY, PRESSURE, LATTICE DYNAMICS, HUGONIOT EQUATIONS.

Subject Categories : Inorganic Chemistry
      Properties of Metals and Alloys
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE