Explicit accounting of electronic effects on the Hugoniot of porous materials

A generalized enthalpy based equation of state, which includes thermal electron excitations explicitly, is formulated from simple considerations. Its application to obtain Hugoniot of materials needs simultaneous evaluation of pressure-volume curve and temperature, the latter requiring solution of a...

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Veröffentlicht in:Journal of applied physics 2016-03, Vol.119 (12)
Hauptverfasser: Nayak, Bishnupriya, Menon, S. V. G.
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description A generalized enthalpy based equation of state, which includes thermal electron excitations explicitly, is formulated from simple considerations. Its application to obtain Hugoniot of materials needs simultaneous evaluation of pressure-volume curve and temperature, the latter requiring solution of a differential equation. The errors involved in two recent papers [Huayun et al., J. Appl. Phys. 92, 5917 (2002); 92, 5924 (2002)], which employed this approach, are brought out and discussed. In addition to developing the correct set of equations, the present work also provides a numerical method to implement this approach. Constant pressure specific heat of ions and electrons and ionic enthalpy parameter, needed for applications, are calculated using a three component equation of state. The method is applied to porous Cu with different initial porosities. Comparison of results with experimental data shows good agreement. It is found that temperatures along the Hugoniot of porous materials are significantly modified due to electronic effects.
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subjects ACCOUNTING
Applied physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COMPARATIVE EVALUATIONS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIFFERENTIAL EQUATIONS
Electronic properties
ELECTRONS
ENTHALPY
EQUATIONS OF STATE
ERRORS
EXCITATION
IONS
Numerical methods
POROSITY
POROUS MATERIALS
SPECIFIC HEAT
title Explicit accounting of electronic effects on the Hugoniot of porous materials
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